aw: Fix FBO restore bug

android_webview/browser/surfaces_instance.cc

 // Copyright 2016 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 "android_webview/browser/surfaces_instance.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "android_webview/browser/aw_gl_surface.h"
@@ skipping 14 matching lines @@
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/transform.h"
 
 namespace android_webview {
 
 namespace {
 SurfacesInstance* g_surfaces_instance = nullptr;
 }  // namespace
 
 // static
-scoped_refptr<SurfacesInstance> SurfacesInstance::GetOrCreateInstance() {
-  if (g_surfaces_instance)
+scoped_refptr<SurfacesInstance> SurfacesInstance::GetOrCreateInstance(
+    int framebuffer_binding_ext) {
+  if (g_surfaces_instance) {
+    g_surfaces_instance->SetBackingFrameBufferObject(framebuffer_binding_ext);
     return make_scoped_refptr(g_surfaces_instance);
-  return make_scoped_refptr(new SurfacesInstance);
+  }
+  return make_scoped_refptr(new SurfacesInstance(framebuffer_binding_ext));
 }
 
-SurfacesInstance::SurfacesInstance()
+SurfacesInstance::SurfacesInstance(int framebuffer_binding_ext)
   : next_surface_id_namespace_(1u),
     gl_surface_(new AwGLSurface) {
+  gl_surface_->SetBackingFrameBufferObject(framebuffer_binding_ext);
   cc::RendererSettings settings;
 
   // Should be kept in sync with compositor_impl_android.cc.
   settings.allow_antialiasing = false;
   settings.highp_threshold_min = 2048;
 
   // Webview does not own the surface so should not clear it.
   settings.should_clear_root_render_pass = false;
 
   surface_manager_.reset(new cc::SurfaceManager);
@@ skipping 132 matching lines @@
   CHECK(resources.empty());
 }
 
 void SurfacesInstance::SetBeginFrameSource(
     cc::BeginFrameSource* begin_frame_source) {
   // Parent compsitor calls DrawAndSwap directly and doesn't use
   // BeginFrameSource.
 }
 
 }  // namespace android_webview