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"
@@ skipping 26 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();
   };
 
+  // Invalidates the cached OpenGL state in GrContext.
+  // See skia GrContext::resetContext for details.
+  virtual void InvalidateGrContext(uint32_t state) = 0;
+
   // 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 28 matching lines @@
       const MemoryPolicyChangedCallback& memory_policy_changed_callback) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<ContextProvider>;
   virtual ~ContextProvider() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_CONTEXT_PROVIDER_H_