[core] Render from the main thread

Do not create a thread for the MapContext anymore.

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapView.java

@@ -521,7 +521,6 @@ public class MapView extends FrameLayout {
         mConnectivityReceiver = null;
 
         mUserLocationView.onPause();
-        mNativeMapView.pause();
     }
 
     /**
@@ -533,7 +532,6 @@ public class MapView extends FrameLayout {
         mConnectivityReceiver = new ConnectivityReceiver();
         getContext().registerReceiver(mConnectivityReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
 
-        mNativeMapView.resume();
         mNativeMapView.update();
         mUserLocationView.onResume();
 
@@ -1094,9 +1092,7 @@ public class MapView extends FrameLayout {
     }
 
     int getTopOffsetPixelsForIcon(Icon icon) {
-        // This method will dead lock if map paused. Causes a freeze if you add a marker in an
-        // activity's onCreate()
-        if (mDestroyed || mNativeMapView.isPaused()) {
+        if (mDestroyed) {
             return 0;
         }
 
@@ -1243,11 +1239,11 @@ public class MapView extends FrameLayout {
             return;
         }
 
-        if (mDestroyed || mNativeMapView.isPaused()) {
+        if (mDestroyed) {
             return;
         }
 
-        mNativeMapView.renderSync();
+        mNativeMapView.render();
     }
 
     @Override

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/NativeMapView.java

@@ -119,24 +119,12 @@ final class NativeMapView {
         nativeDestroySurface(mNativeMapViewPtr);
     }
 
-    public void pause() {
-        nativePause(mNativeMapViewPtr);
-    }
-
-    public boolean isPaused() {
-        return nativeIsPaused(mNativeMapViewPtr);
-    }
-
-    public void resume() {
-        nativeResume(mNativeMapViewPtr);
-    }
-
     public void update() {
         nativeUpdate(mNativeMapViewPtr);
     }
 
-    public void renderSync() {
-        nativeRenderSync(mNativeMapViewPtr);
+    public void render() {
+        nativeRender(mNativeMapViewPtr);
     }
 
     public void resizeView(int width, int height) {
@@ -515,15 +503,9 @@ final class NativeMapView {
 
     private native void nativeDestroySurface(long nativeMapViewPtr);
 
-    private native void nativePause(long nativeMapViewPtr);
-
-    private native boolean nativeIsPaused(long nativeMapViewPtr);
-
-    private native void nativeResume(long nativeMapViewPtr);
-
     private native void nativeUpdate(long nativeMapViewPtr);
 
-    private native void nativeRenderSync(long nativeMapViewPtr);
+    private native void nativeRender(long nativeMapViewPtr);
 
     private native void nativeViewResize(long nativeMapViewPtr, int width, int height);