Add ContextProvider::InvalidateGrContext to reset GL state in GrContext

cc/test/test_in_process_context_provider.cc

 // Copyright 2013 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/test_in_process_context_provider.h"
 
 #include "base/lazy_instance.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/gl_in_process_context.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
@@ skipping 106 matching lines @@
       skia::AdoptRef(skia_bindings::CreateCommandBufferSkiaGLBinding());
   interface->fCallback = BindGrContextCallback;
   interface->fCallbackData = reinterpret_cast<GrGLInterfaceCallbackData>(this);
 
   gr_context_ = skia::AdoptRef(GrContext::Create(
       kOpenGL_GrBackend, reinterpret_cast<GrBackendContext>(interface.get())));
 
   return gr_context_.get();
 }
 
+void TestInProcessContextProvider::InvalidateGrContext(uint32_t state) {
+  if (gr_context_)
+    gr_context_.get()->resetContext(state);
+}
+
 void TestInProcessContextProvider::SetupLock() {
 }
 
 base::Lock* TestInProcessContextProvider::GetLock() {
   return &context_lock_;
 }
 
 ContextProvider::Capabilities
 TestInProcessContextProvider::ContextCapabilities() {
   ContextProvider::Capabilities capabilities;
@@ skipping 14 matching lines @@
 
 bool TestInProcessContextProvider::DestroyedOnMainThread() { return false; }
 
 void TestInProcessContextProvider::SetLostContextCallback(
     const LostContextCallback& lost_context_callback) {}
 
 void TestInProcessContextProvider::SetMemoryPolicyChangedCallback(
     const MemoryPolicyChangedCallback& memory_policy_changed_callback) {}
 
 }  // namespace cc