Support creation of RGB565 JavaBitmap from helper.

ui/android/java/src/org/chromium/ui/gfx/BitmapHelper.java

Index: ui/android/java/src/org/chromium/ui/gfx/BitmapHelper.java
diff --git a/ui/android/java/src/org/chromium/ui/gfx/BitmapHelper.java b/ui/android/java/src/org/chromium/ui/gfx/BitmapHelper.java
index 91389022362ecf66f8d060eeb107e02eb1cb6cf5..10eb53a3188bfc8700239f1e482b7bd76a375b2e 100644
--- a/ui/android/java/src/org/chromium/ui/gfx/BitmapHelper.java
+++ b/ui/android/java/src/org/chromium/ui/gfx/BitmapHelper.java
@@ -17,7 +17,12 @@ import org.chromium.base.JNINamespace;
 @JNINamespace("gfx")
 public class BitmapHelper {
     @CalledByNative
-    public static Bitmap createBitmap(int width, int height) {
+    private static Bitmap createBitmap(int width,
+                                      int height,
+                                      boolean is565Config) {
+        if (is565Config) {
+            return Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
+        }
         return Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
     }