Add a flag to allow renderer to use software compositor when GL compositor doesn't work.

content/browser/renderer_host/compositor_impl_android.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/renderer_host/compositor_impl_android.h"
 
 #include <android/bitmap.h>
 #include <android/native_window_jni.h>
 #include <map>
 
@@ skipping 340 matching lines @@
   DCHECK(bitmap.size() == sub_rect.size());
   if (bitmap.size() != sub_rect.size() || texture_id == 0) return false;
 
   GLHelper* helper = ImageTransportFactoryAndroid::GetInstance()->GetGLHelper();
   helper->ReadbackTextureSync(texture_id,
                               sub_rect,
                               static_cast<unsigned char*> (bitmap.pixels()));
   return true;
 }
 
-scoped_ptr<cc::OutputSurface> CompositorImpl::CreateOutputSurface() {
+scoped_ptr<cc::OutputSurface> CompositorImpl::CreateOutputSurface(
+    bool fallback) {
   WebKit::WebGraphicsContext3D::Attributes attrs;
   attrs.shareResources = true;
   attrs.noAutomaticFlushes = true;
 
   if (g_use_direct_gl) {
     scoped_ptr<WebKit::WebGraphicsContext3D> context(
         webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl::
             CreateViewContext(attrs, window_));
     if (!window_) {
       return scoped_ptr<cc::OutputSurface>(
@@ skipping 124 matching lines @@
     case ANDROID_BITMAP_FORMAT_RGBA_8888:
       return GL_UNSIGNED_BYTE;
       break;
     case ANDROID_BITMAP_FORMAT_RGB_565:
     default:
       return GL_UNSIGNED_SHORT_5_6_5;
   }
 }
 
 } // namespace content