[core] Rename "onLowMemory" to "reduceMemoryUse".

Android still calls "reduceMemoryUse" only while handling a low memory event.
iOS, on the other hand, calls "reduceMemoryUse" every time it enters the background.

src/mbgl/annotation/render_annotation_source.cpp

@@ -73,8 +73,8 @@ std::vector<Feature> RenderAnnotationSource::querySourceFeatures(const SourceQue
     return {};
 }
 
-void RenderAnnotationSource::onLowMemory() {
-    tilePyramid.onLowMemory();
+void RenderAnnotationSource::reduceMemoryUse() {
+    tilePyramid.reduceMemoryUse();
 }
 
 void RenderAnnotationSource::dumpDebugLogs() const {

src/mbgl/annotation/render_annotation_source.hpp

@@ -33,7 +33,7 @@ public:
     std::vector<Feature>
     querySourceFeatures(const SourceQueryOptions&) const final;
 
-    void onLowMemory() final;
+    void reduceMemoryUse() final;
     void dumpDebugLogs() const final;
 
 private:

src/mbgl/renderer/render_source.hpp

@@ -70,7 +70,7 @@ public:
     virtual std::vector<Feature>
     querySourceFeatures(const SourceQueryOptions&) const = 0;
 
-    virtual void onLowMemory() = 0;
+    virtual void reduceMemoryUse() = 0;
 
     virtual void dumpDebugLogs() const = 0;
 

src/mbgl/renderer/renderer.cpp

@@ -94,9 +94,9 @@ void Renderer::dumpDebugLogs() {
     impl->dumDebugLogs();
 }
 
-void Renderer::onLowMemory() {
+void Renderer::reduceMemoryUse() {
     BackendScope guard { impl->backend };
-    impl->onLowMemory();
+    impl->reduceMemoryUse();
 }
 
 } // namespace mbgl

src/mbgl/renderer/renderer_impl.cpp

@@ -722,10 +722,10 @@ std::vector<Feature> Renderer::Impl::querySourceFeatures(const std::string& sour
     return source->querySourceFeatures(options);
 }
 
-void Renderer::Impl::onLowMemory() {
+void Renderer::Impl::reduceMemoryUse() {
     assert(BackendScope::exists());
     for (const auto& entry : renderSources) {
-        entry.second->onLowMemory();
+        entry.second->reduceMemoryUse();
     }
     backend.getContext().performCleanup();
     observer->onInvalidate();

src/mbgl/renderer/renderer_impl.hpp

@@ -53,7 +53,7 @@ public:
     std::vector<Feature> querySourceFeatures(const std::string& sourceID, const SourceQueryOptions&) const;
     std::vector<Feature> queryShapeAnnotations(const ScreenLineString&) const;
 
-    void onLowMemory();
+    void reduceMemoryUse();
     void dumDebugLogs();
 
 private:

src/mbgl/renderer/sources/render_custom_geometry_source.cpp

@@ -76,8 +76,8 @@ std::vector<Feature> RenderCustomGeometrySource::querySourceFeatures(const Sourc
     return tilePyramid.querySourceFeatures(options);
 }
 
-void RenderCustomGeometrySource::onLowMemory() {
-    tilePyramid.onLowMemory();
+void RenderCustomGeometrySource::reduceMemoryUse() {
+    tilePyramid.reduceMemoryUse();
 }
 
 void RenderCustomGeometrySource::dumpDebugLogs() const {

src/mbgl/renderer/sources/render_custom_geometry_source.hpp

@@ -33,7 +33,7 @@ public:
     std::vector<Feature>
     querySourceFeatures(const SourceQueryOptions&) const final;
 
-    void onLowMemory() final;
+    void reduceMemoryUse() final;
     void dumpDebugLogs() const final;
     
 private:

src/mbgl/renderer/sources/render_geojson_source.cpp

@@ -94,8 +94,8 @@ std::vector<Feature> RenderGeoJSONSource::querySourceFeatures(const SourceQueryO
     return tilePyramid.querySourceFeatures(options);
 }
 
-void RenderGeoJSONSource::onLowMemory() {
-    tilePyramid.onLowMemory();
+void RenderGeoJSONSource::reduceMemoryUse() {
+    tilePyramid.reduceMemoryUse();
 }
 
 void RenderGeoJSONSource::dumpDebugLogs() const {

src/mbgl/renderer/sources/render_geojson_source.hpp

@@ -37,7 +37,7 @@ public:
     std::vector<Feature>
     querySourceFeatures(const SourceQueryOptions&) const final;
 
-    void onLowMemory() final;
+    void reduceMemoryUse() final;
     void dumpDebugLogs() const final;
 
 private:

src/mbgl/renderer/sources/render_image_source.hpp

@@ -37,7 +37,7 @@ public:
 
     std::vector<Feature> querySourceFeatures(const SourceQueryOptions&) const final;
 
-    void onLowMemory() final {
+    void reduceMemoryUse() final {
     }
     void dumpDebugLogs() const final;
 

src/mbgl/renderer/sources/render_raster_dem_source.cpp

@@ -155,8 +155,8 @@ std::vector<Feature> RenderRasterDEMSource::querySourceFeatures(const SourceQuer
     return {};
 }
 
-void RenderRasterDEMSource::onLowMemory() {
-    tilePyramid.onLowMemory();
+void RenderRasterDEMSource::reduceMemoryUse() {
+    tilePyramid.reduceMemoryUse();
 }
 
 void RenderRasterDEMSource::dumpDebugLogs() const {

src/mbgl/renderer/sources/render_raster_dem_source.hpp

@@ -33,7 +33,7 @@ public:
     std::vector<Feature>
     querySourceFeatures(const SourceQueryOptions&) const final;
 
-    void onLowMemory() final;
+    void reduceMemoryUse() final;
     void dumpDebugLogs() const final;
 
 private:

src/mbgl/renderer/sources/render_raster_source.cpp

@@ -85,8 +85,8 @@ std::vector<Feature> RenderRasterSource::querySourceFeatures(const SourceQueryOp
     return {};
 }
 
-void RenderRasterSource::onLowMemory() {
-    tilePyramid.onLowMemory();
+void RenderRasterSource::reduceMemoryUse() {
+    tilePyramid.reduceMemoryUse();
 }
 
 void RenderRasterSource::dumpDebugLogs() const {

src/mbgl/renderer/sources/render_raster_source.hpp

@@ -33,7 +33,7 @@ public:
     std::vector<Feature>
     querySourceFeatures(const SourceQueryOptions&) const final;
 
-    void onLowMemory() final;
+    void reduceMemoryUse() final;
     void dumpDebugLogs() const final;
 
 private:

src/mbgl/renderer/sources/render_vector_source.cpp

@@ -88,8 +88,8 @@ std::vector<Feature> RenderVectorSource::querySourceFeatures(const SourceQueryOp
     return tilePyramid.querySourceFeatures(options);
 }
 
-void RenderVectorSource::onLowMemory() {
-    tilePyramid.onLowMemory();
+void RenderVectorSource::reduceMemoryUse() {
+    tilePyramid.reduceMemoryUse();
 }
 
 void RenderVectorSource::dumpDebugLogs() const {

src/mbgl/renderer/sources/render_vector_source.hpp

@@ -33,7 +33,7 @@ public:
     std::vector<Feature>
     querySourceFeatures(const SourceQueryOptions&) const final;
 
-    void onLowMemory() final;
+    void reduceMemoryUse() final;
     void dumpDebugLogs() const final;
 
 private:

src/mbgl/renderer/tile_pyramid.cpp

@@ -303,7 +303,7 @@ void TilePyramid::setCacheSize(size_t size) {
     cache.setSize(size);
 }
 
-void TilePyramid::onLowMemory() {
+void TilePyramid::reduceMemoryUse() {
     cache.clear();
 }
 

src/mbgl/renderer/tile_pyramid.hpp

@@ -59,7 +59,7 @@ public:
     std::vector<Feature> querySourceFeatures(const SourceQueryOptions&) const;
 
     void setCacheSize(size_t);
-    void onLowMemory();
+    void reduceMemoryUse();
 
     void setObserver(TileObserver*);
     void dumpDebugLogs() const;