Free the command buffer when tabs are switched

gpu/command_buffer/service/gpu_scheduler.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.
 
 #include "gpu/command_buffer/service/gpu_scheduler.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/trace_event.h"
 #include "base/message_loop.h"
 #include "base/time.h"
 #include "ui/gfx/gl/gl_bindings.h"
 #include "ui/gfx/gl/gl_switches.h"
 
 using ::base::SharedMemory;
 
 namespace gpu {
 
-GpuScheduler::GpuScheduler(CommandBuffer* command_buffer,
-                           gles2::GLES2Decoder* decoder,
-                           CommandParser* parser)
+GpuScheduler::GpuScheduler(
+    CommandBuffer* command_buffer,
+    AsyncAPIInterface* handler,
+    gles2::GLES2Decoder* decoder)
     : command_buffer_(command_buffer),
+      handler_(handler),
       decoder_(decoder),
-      parser_(parser),
+      parser_(NULL),
       unscheduled_count_(0) {
 }
 
 GpuScheduler::~GpuScheduler() {
 }
 
 void GpuScheduler::PutChanged() {
   TRACE_EVENT1("gpu", "GpuScheduler:PutChanged", "this", this);
 
   CommandBuffer::State state = command_buffer_->GetState();
@@ skipping 78 matching lines @@
   command_buffer_->SetToken(token);
 }
 
 bool GpuScheduler::SetGetBuffer(int32 transfer_buffer_id) {
   Buffer ring_buffer = command_buffer_->GetTransferBuffer(transfer_buffer_id);
   if (!ring_buffer.ptr) {
     return false;
   }
 
   if (!parser_.get()) {
-    parser_.reset(new CommandParser(decoder_));
+    parser_.reset(new CommandParser(handler_));
   }
 
   parser_->SetBuffer(
       ring_buffer.ptr,
       ring_buffer.size,
       0,
       ring_buffer.size);
 
   SetGetOffset(0);
   return true;
@@ skipping 66 matching lines @@
   return true;
 }
 
 GpuScheduler::UnscheduleFence::UnscheduleFence() : fence(0) {
 }
 
 GpuScheduler::UnscheduleFence::~UnscheduleFence() {
 }
 
 }  // namespace gpu