Add layerTreeBuildHelper to control layer tree in ContentViewRenderView

content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
index 35ce1c6282427f64444437b06c03c9856167b257..dac3455be09a22beb3bbf7bd46ca313fa7276696 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
@@ -43,7 +43,7 @@ public class ContentViewRenderView extends FrameLayout {
     private int mPendingSwapBuffers;
     private boolean mNeedToRender;
 
-    private ContentView mCurrentContentView;
+    protected ContentView mCurrentContentView;
 
     private final Runnable mRenderRunnable = new Runnable() {
         @Override
@@ -266,6 +266,13 @@ public class ContentViewRenderView extends FrameLayout {
         nativeSetOverlayVideoMode(mNativeContentViewRenderView, enabled);
     }
 
+    /**
+     *
+     */
+    public void setLayerTreeBuildHelper(long layerTreeBuildHelperNativePtr) {
+        nativeSetLayerTreeBuildHelper(mNativeContentViewRenderView, layerTreeBuildHelperNativePtr);
+    }
+
     @CalledByNative
     private void requestRender() {
         ContentViewCore contentViewCore = mCurrentContentView != null ?
@@ -305,7 +312,7 @@ public class ContentViewRenderView extends FrameLayout {
         if (mPendingSwapBuffers > 0) mPendingSwapBuffers--;
     }
 
-    private void render() {
+    protected void render() {
         if (mPendingRenders > 0) mPendingRenders--;
 
         // Waiting for the content view contents to be ready avoids compositing
@@ -334,6 +341,8 @@ public class ContentViewRenderView extends FrameLayout {
     private native void nativeDestroy(long nativeContentViewRenderView);
     private native void nativeSetCurrentContentView(long nativeContentViewRenderView,
             long nativeContentView);
+    private native void nativeSetLayerTreeBuildHelper(long nativeContentViewRenderView,
+            long buildHelperNativePtr);
     private native void nativeSurfaceCreated(long nativeContentViewRenderView);
     private native void nativeSurfaceDestroyed(long nativeContentViewRenderView);
     private native void nativeSurfaceChanged(long nativeContentViewRenderView,