Free the command buffer when tabs are switched

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 719 matching lines @@
 }
 
 void GLES2Implementation::FreeUnusedSharedMemory() {
   mapped_memory_->FreeUnused();
 }
 
 void GLES2Implementation::FreeEverything() {
   Finish();
   FreeUnusedSharedMemory();
   transfer_buffer_.Free();
+  helper_->FreeRingBuffer();
 }
 
 void GLES2Implementation::WaitForCmd() {
   TRACE_EVENT0("gpu", "GLES2::WaitForCmd");
   helper_->CommandBufferHelper::Finish();
 }
 
 namespace {
 bool IsExtensionAvailable(GLES2Implementation* gles2, const char ext[]) {
   const char* extensions = reinterpret_cast<const char*>(
@@ skipping 2136 matching lines @@
   helper_->PostSubBufferCHROMIUM(x, y, width, height);
   helper_->CommandBufferHelper::Flush();
   if (swap_buffers_tokens_.size() > kMaxSwapBuffers + 1) {
     helper_->WaitForToken(swap_buffers_tokens_.front());
     swap_buffers_tokens_.pop();
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu