Fix the problem that VR desktop take a while to draw and black background of menu bar

remoting/android/java/src/org/chromium/chromoting/cardboard/CardboardRenderer.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chromoting.cardboard;
 
 import android.app.Activity;
 import android.graphics.Point;
 import android.graphics.PointF;
 import android.opengl.GLES20;
@@ skipping 84 matching lines @@
         mProjectionMatrix = new float[16];
         mDesktopModelMatrix = new float[16];
         mDesktopCombinedMatrix = new float[16];
         mEyePointModelMatrix = new float[16];
         mEyePointCombinedMatrix = new float[16];
         mPhotosphereCombinedMatrix = new float[16];
 
         mForwardVector = new float[3];
     }
 
-    // This can be called on any thread.
-    public void attachRedrawCallback() {
-        JniInterface.provideRedrawCallback(new Runnable() {
-            @Override
+    private void initializeRedrawCallback() {
+        mActivity.runOnUiThread(new Runnable() {
             public void run() {
-                mDesktop.reloadTexture();
-                mCursor.reloadTexture();
+                JniInterface.provideRedrawCallback(new Runnable() {
+                    @Override
+                    public void run() {
+                        mDesktop.reloadTexture();
+                        mCursor.reloadTexture();
+                    }
+                });
+
+                JniInterface.redrawGraphics();
             }
         });
     }
 
     @Override
     public void onSurfaceCreated(EGLConfig config) {
         // Set the background clear color to black.
         GLES20.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 
         // Use culling to remove back faces.
         GLES20.glEnable(GLES20.GL_CULL_FACE);
 
         // Enable depth testing.
         GLES20.glEnable(GLES20.GL_DEPTH_TEST);
 
         mDesktop = new Desktop();
         mMenuBar = new MenuBar(mActivity);
         mPhotosphere = new Photosphere(mActivity);
         mCursor = new Cursor();
 
-        attachRedrawCallback();
+        initializeRedrawCallback();
     }
 
     @Override
     public void onSurfaceChanged(int width, int height) {
     }
 
     @Override
     public void onNewFrame(HeadTransform headTransform) {
         // Position the eye at the origin.
         float eyeX = 0.0f;
@@ skipping 27 matching lines @@
     @Override
     public void onDrawEye(Eye eye) {
         GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
 
         // Apply the eye transformation to the camera.
         Matrix.multiplyMM(mViewMatrix, 0, eye.getEyeView(), 0, mCameraMatrix, 0);
 
         mProjectionMatrix = eye.getPerspective(Z_NEAR, Z_FAR);
 
         drawDesktop();
+        drawPhotosphere();
         drawMenuBar();
-        drawPhotosphere();
         drawCursor();
     }
 
     @Override
     public void onRendererShutdown() {
         mDesktop.cleanup();
         mMenuBar.cleanup();
         mPhotosphere.cleanup();
         mCursor.cleanup();
     }
@@ skipping 178 matching lines @@
         mMenuBarVisible = visible;
     }
 
     /**
      * Return true if menu bar is visible.
      */
     public boolean isMenuBarVisible() {
         return mMenuBarVisible;
     }
 }