Free the command buffer when tabs are switched

gpu/command_buffer/client/mapped_memory_unittest.cc

Index: gpu/command_buffer/client/mapped_memory_unittest.cc
diff --git a/gpu/command_buffer/client/mapped_memory_unittest.cc b/gpu/command_buffer/client/mapped_memory_unittest.cc
index c18ec9f540cb4cb020ec7522b510055e1eba0add..4442d88466f3bee96e8a10a6a9ad8f574feed56b 100644
--- a/gpu/command_buffer/client/mapped_memory_unittest.cc
+++ b/gpu/command_buffer/client/mapped_memory_unittest.cc
@@ -44,23 +44,17 @@ class MappedMemoryTestBase : public testing::Test {
     command_buffer_.reset(new CommandBufferService);
     command_buffer_->Initialize();
 
-    parser_ = new CommandParser(api_mock_.get());
-
     gpu_scheduler_.reset(new GpuScheduler(
-        command_buffer_.get(), NULL, parser_));
+        command_buffer_.get(), api_mock_.get(), NULL));
     command_buffer_->SetPutOffsetChangeCallback(base::Bind(
         &GpuScheduler::PutChanged, base::Unretained(gpu_scheduler_.get())));
+    command_buffer_->SetGetBufferChangeCallback(base::Bind(
+        &GpuScheduler::SetGetBuffer, base::Unretained(gpu_scheduler_.get())));
 
     api_mock_->set_engine(gpu_scheduler_.get());
 
     helper_.reset(new CommandBufferHelper(command_buffer_.get()));
     helper_->Initialize(kBufferSize);
-
-    // Note: parser->SetBuffer would normally be called through
-    // helper_->Initialize but currently it needs a GpuCommandBufferStub as the
-    // CommandBuffer instead of the CommandBufferService for that to happen.
-    Buffer ring_buffer = helper_->get_ring_buffer();
-    parser_->SetBuffer(ring_buffer.ptr, ring_buffer.size, 0, ring_buffer.size);
   }
 
   int32 GetToken() {
@@ -74,7 +68,6 @@ class MappedMemoryTestBase : public testing::Test {
   scoped_ptr<AsyncAPIMock> api_mock_;
   scoped_ptr<CommandBufferService> command_buffer_;
   scoped_ptr<GpuScheduler> gpu_scheduler_;
-  CommandParser* parser_;
   scoped_ptr<CommandBufferHelper> helper_;
 };