Add GLES2Implemention::FreeUnusedSharedMemory

gpu/command_buffer/client/gles2_implementation.cc

 // Copyright (c) 2011 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.
 
 // A class to emulate GLES2 over command buffers.
 
 #include "../client/gles2_implementation.h"
 
 #include <set>
 #include <queue>
@@ skipping 623 matching lines @@
       reserved_ids_[1]));
 #endif
 }
 
 GLES2Implementation::~GLES2Implementation() {
 #if defined(GLES2_SUPPORT_CLIENT_SIDE_ARRAYS)
   DeleteBuffers(arraysize(reserved_ids_), &reserved_ids_[0]);
 #endif
 }
 
+void GLES2Implementation::FreeUnusedSharedMemory() {
+  mapped_memory_->FreeUnused();
+}
+
 void GLES2Implementation::WaitForCmd() {
   TRACE_EVENT0("gpu", "GLES2::WaitForCmd");
   helper_->CommandBufferHelper::Finish();
 }
 
 GLenum GLES2Implementation::GetError() {
   GPU_CLIENT_LOG("[" << this << "] glGetError()");
   GLenum err = GetGLError();
   GPU_CLIENT_LOG("returned " << GLES2Util::GetStringError(err));
   return err;
@@ skipping 1994 matching lines @@
 
 void GLES2Implementation::DestroyStreamTextureCHROMIUM(GLuint texture) {
   GPU_CLIENT_LOG("[" << this << "] DestroyStreamTextureCHROMIUM("
       << texture << ")");
   TRACE_EVENT0("gpu", "GLES2::DestroyStreamTextureCHROMIUM");
   helper_->DestroyStreamTextureCHROMIUM(texture);
 }
 
 }  // namespace gles2
 }  // namespace gpu