cc: Unify context losing machinery

cc/test/fake_web_graphics_context_3d.cc

Index: cc/test/fake_web_graphics_context_3d.cc
diff --git a/cc/test/fake_web_graphics_context_3d.cc b/cc/test/fake_web_graphics_context_3d.cc
index 52c765d688a36bba486794ac664096849f4bba3f..48269eaeac56a60a58e4099e368e309381d46a8b 100644
--- a/cc/test/fake_web_graphics_context_3d.cc
+++ b/cc/test/fake_web_graphics_context_3d.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "cc/test/fake_web_graphics_context_3d.h"
+#include "third_party/khronos/GLES2/gl2ext.h"
 
 namespace cc {
 
@@ -36,7 +37,11 @@ WebKit::WebGLId FakeWebGraphicsContext3D::getPlatformTextureId() {
 }
 
 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(
@@ -219,4 +224,15 @@ 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