Android: Free GLHelper context ashmem when it makes sense

content/common/gpu/client/context_provider_command_buffer.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 CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER_H_
 #define CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 46 matching lines @@
       bool support_locking,
       const gpu::SharedMemoryLimits& memory_limits,
       const gpu::gles2::ContextCreationAttribHelper& attributes,
       ContextProviderCommandBuffer* shared_context_provider,
       command_buffer_metrics::ContextType type);
 
   gpu::CommandBufferProxyImpl* GetCommandBufferProxy();
   // Gives the GL internal format that should be used for calling CopyTexImage2D
   // on the default framebuffer.
   uint32_t GetCopyTextureInternalFormat();
+  void FreeUnusedSharedMemory();

[danakj, 2016/09/26 22:56:40]

FWIW I think this should be part of ContextSupport or something, but I'd rather
merge it/replace somehow the ShouldAggressivelyFreeResources so I'm happy with
this here instead of on the ContextSupport API for now.

 
   // cc::ContextProvider implementation.
   bool BindToCurrentThread() override;
   void DetachFromThread() override;
   gpu::gles2::GLES2Interface* ContextGL() override;
   gpu::ContextSupport* ContextSupport() override;
   class GrContext* GrContext() override;
   cc::ContextCacheController* CacheController() override;
   void InvalidateGrContext(uint32_t state) override;
   base::Lock* GetLock() override;
@@ skipping 52 matching lines @@
   std::unique_ptr<gpu::gles2::GLES2TraceImplementation> trace_impl_;
   std::unique_ptr<skia_bindings::GrContextForGLES2Interface> gr_context_;
   std::unique_ptr<cc::ContextCacheController> cache_controller_;
 
   LostContextCallback lost_context_callback_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER_H_