Free the command buffer when tabs are switched

gpu/command_buffer/service/gpu_scheduler_unittest.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 "base/message_loop.h"
 #include "gpu/command_buffer/common/command_buffer_mock.h"
 #include "gpu/command_buffer/service/gpu_scheduler.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_mock.h"
 #include "gpu/command_buffer/service/mocks.h"
@@ skipping 27 matching lines @@
     buffer_ = static_cast<int32*>(shared_memory_->memory());
     shared_memory_buffer_.ptr = buffer_;
     shared_memory_buffer_.size = kRingBufferSize;
     memset(buffer_, 0, kRingBufferSize);
 
     command_buffer_.reset(new MockCommandBuffer);
 
     CommandBuffer::State default_state;
     default_state.num_entries = kRingBufferEntries;
     ON_CALL(*command_buffer_.get(), GetState())
-      .WillByDefault(Return(default_state));
+        .WillByDefault(Return(default_state));
 
     decoder_.reset(new gles2::MockGLES2Decoder());
     scheduler_.reset(new gpu::GpuScheduler(command_buffer_.get(),
                                            decoder_.get(),
-                                           NULL));
+                                           decoder_.get()));
     EXPECT_CALL(*command_buffer_, GetTransferBuffer(kTransferBufferId))
        .WillOnce(Return(shared_memory_buffer_));
     EXPECT_CALL(*command_buffer_, SetGetOffset(0));
     EXPECT_TRUE(scheduler_->SetGetBuffer(kTransferBufferId));
   }
 
   virtual void TearDown() {
     // Ensure that any unexpected tasks posted by the GPU scheduler are executed
     // in order to fail the test.
     MessageLoop::current()->RunAllPending();
@@ skipping 145 matching lines @@
 
   EXPECT_EQ(kRingBufferSize, scheduler_->GetSharedMemoryBuffer(7).size);
 }
 
 TEST_F(GpuSchedulerTest, SetTokenForwardsToCommandBuffer) {
   EXPECT_CALL(*command_buffer_, SetToken(7));
   scheduler_->set_token(7);
 }
 
 }  // namespace gpu