cc: Unify context losing machinery

cc/test/fake_web_graphics_context_3d.cc

 // Copyright 2011 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 "cc/test/fake_web_graphics_context_3d.h"
+#include "third_party/khronos/GLES2/gl2ext.h"
 
 namespace cc {
 
 bool FakeWebGraphicsContext3D::makeContextCurrent() {
   return true;
 }
 
 int FakeWebGraphicsContext3D::width() {
   return 0;
 }
@@ skipping 13 matching lines @@
     int width,
     int height) {
   return false;
 }
 
 WebKit::WebGLId FakeWebGraphicsContext3D::getPlatformTextureId() {
   return 0;
 }
 
 bool FakeWebGraphicsContext3D::isContextLost() {
-  return false;
+  return m_contextLost;
+}
+
+WebKit::WGC3Denum FakeWebGraphicsContext3D::getGraphicsResetStatusARB() {
+  return m_contextLost ? GL_UNKNOWN_CONTEXT_RESET_ARB : GL_NO_ERROR;
 }
 
 void* FakeWebGraphicsContext3D::mapBufferSubDataCHROMIUM(
     WebKit::WGC3Denum target,
     WebKit::WGC3Dintptr offset,
     WebKit::WGC3Dsizeiptr size,
     WebKit::WGC3Denum access) {
   return 0;
 }
 
@@ skipping 162 matching lines @@
 }
 
 WebKit::WebGLId FakeWebGraphicsContext3D::createQueryEXT() {
   return 1;
 }
 
 WebKit::WGC3Dboolean FakeWebGraphicsContext3D::isQueryEXT(WebKit::WebGLId) {
   return true;
 }
 
+void FakeWebGraphicsContext3D::setContextLostCallback(
+    WebGraphicsContextLostCallback* callback) {
+  m_contextLostCallback = callback;
+}
+
+void FakeWebGraphicsContext3D::loseContext() {
+  m_contextLost = true;
+  if (m_contextLostCallback)
+    m_contextLostCallback->onContextLost();
+}
+
 }  // namespace cc