Add ContextProvider::InvalidateGrContext to reset GL state in GrContext

cc/output/context_provider.h

 // Copyright (c) 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.
 
 #ifndef CC_OUTPUT_CONTEXT_PROVIDER_H_
 #define CC_OUTPUT_CONTEXT_PROVIDER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "cc/base/cc_export.h"
 #include "gpu/command_buffer/common/capabilities.h"
-
-class GrContext;
+#include "third_party/skia/include/gpu/GrContext.h"
 
 namespace base {
 class Lock;
 }
 
 namespace gpu {
 class ContextSupport;
 namespace gles2 { class GLES2Interface; }
 }
 
@@ skipping 13 matching lines @@
   virtual gpu::ContextSupport* ContextSupport() = 0;
   virtual class GrContext* GrContext() = 0;
 
   struct Capabilities {
     gpu::Capabilities gpu;
     size_t max_transfer_buffer_usage_bytes;
 
     CC_EXPORT Capabilities();
   };
 
+  // invalidate the cached OGL state in GrContext

[piman, 2015/05/06 22:03:40]

nit: "Invalidates" (uppercase, descriptive rather than imperative), and end with
a period.

[CodeByThePound, 2015/05/06 22:27:55]

Acknowledged.

+  void InvalidateGrContext(uint32_t state = kAll_GrBackendState);

[piman, 2015/05/06 22:03:40]

nit: no default arguments, per style guide

[CodeByThePound, 2015/05/06 22:27:55]

Acknowledged.

+
   // Sets up a lock so this context can be used from multiple threads.
   virtual void SetupLock() = 0;
 
   // Returns the lock that should be held if using this context from multiple
   // threads.
   virtual base::Lock* GetLock() = 0;
 
   // Returns the capabilities of the currently bound 3d context.
   virtual Capabilities ContextCapabilities() = 0;
 
@@ skipping 23 matching lines @@
   // Sets a callback to be called when the memory policy changes. This should be
   // called from the same thread that the context is bound to.
   typedef base::Callback<void(const ManagedMemoryPolicy& policy)>
       MemoryPolicyChangedCallback;
   virtual void SetMemoryPolicyChangedCallback(
       const MemoryPolicyChangedCallback& memory_policy_changed_callback) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<ContextProvider>;
   virtual ~ContextProvider() {}
+
+ private:
+  virtual void DoInvalidateGrContext(uint32_t) = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_CONTEXT_PROVIDER_H_