[android] Android implementation of local CJK glyph rendering

- Draws bold version of glyph if font stack contains string "bold"
 - Not hooked up to global configuration yet

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/text/LocalGlyphRasterizer.java

@@ -0,0 +1,46 @@
+package com.mapbox.mapboxsdk.text;
+
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Bitmap;
+import android.graphics.Typeface;
+import android.support.annotation.WorkerThread;
+
+/**
+ * LocalGlyphRasterizer is the Android-specific platform implementation used
+ * by the portable local_glyph_rasterizer.hpp
+ */
+public class LocalGlyphRasterizer {
+
+  /***
+   * Uses Android-native drawing code to rasterize a single glyph
+   * to a square @{link Bitmap} which can be returned to portable
+   * code for transformation into a Signed Distance Field glyph.
+   *
+   * @param fontFamily Font family string to pass to Typeface.create
+   * @param bold If true, use Typeface.BOLD option
+   * @param glyphID 16-bit Unicode BMP codepoint to draw
+   *
+   * @return Return a @{link Bitmap} to be displayed in the requested tile.
+   */
+  @WorkerThread
+  protected static Bitmap drawGlyphBitmap(String fontFamily, boolean bold, char glyphID) {
+    /*
+      35x35px dimensions are hardwired to match local_glyph_rasterizer.cpp
+      These dimensions are large enough to draw a 24 point character in the middle
+      of the bitmap (y: 20) with some buffer around the edge
+    */
+    Bitmap bitmap = Bitmap.createBitmap(35, 35, Bitmap.Config.ARGB_8888);
+
+    Paint paint = new Paint();
+    paint.setAntiAlias(true);
+    paint.setTextSize(24);
+    paint.setTypeface(Typeface.create(fontFamily, bold ? Typeface.BOLD : Typeface.NORMAL));
+
+    Canvas canvas = new Canvas();
+    canvas.setBitmap(bitmap);
+    canvas.drawText(String.valueOf(glyphID), 0, 20, paint);
+
+    return bitmap;
+  }
+}