Introduce ChromeVR to Chrome on Android (behind a build flag)

chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
index 49d94a65db23ae1f957b81169c0e7a1cd290ba69..6f23f2c9a1f81fe91b52664adbb559531fc3ea8e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
@@ -10,6 +10,7 @@ import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Rect;
 import android.graphics.RectF;
+import android.graphics.SurfaceTexture;
 import android.os.Bundle;
 import android.os.Handler;
 import android.support.design.widget.CoordinatorLayout;
@@ -281,6 +282,13 @@ public class CompositorViewHolder extends CoordinatorLayout
     }
 
     /**
+     * Replace the Surface that CompositorView has with a new Surface that backed by SurfaceTexture.
+     */
+    public void replaceCompositorSurface(SurfaceTexture surfaceTexture) {
+        mCompositorView.replaceCompositorSurface(surfaceTexture);
+    }
+
+    /**
      * This is called when the native library are ready.
      */
     public void onNativeLibraryReady(