Changed pack alignment of GPU command buffer commands.

gpu/command_buffer/service/transfer_buffer_manager.cc

Index: gpu/command_buffer/service/transfer_buffer_manager.cc
diff --git a/gpu/command_buffer/service/transfer_buffer_manager.cc b/gpu/command_buffer/service/transfer_buffer_manager.cc
index 76443a1f2500022dd797f8847b4997b1a36fdbe9..51484e39cdbf50c5d1c78ecc4bec8b98c9df25ca 100644
--- a/gpu/command_buffer/service/transfer_buffer_manager.cc
+++ b/gpu/command_buffer/service/transfer_buffer_manager.cc
@@ -10,6 +10,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/debug/trace_event.h"
 #include "base/process/process_handle.h"
+#include "gpu/command_buffer/common/cmd_buffer_common.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 
 using ::base::SharedMemory;
@@ -75,6 +76,10 @@ bool TransferBufferManager::RegisterTransferBuffer(
   buffer.size = size;
   buffer.shared_memory = duped_shared_memory.release();
 
+  // Check buffer alignment is sane.
+  DCHECK(!(reinterpret_cast<uintptr_t>(buffer.ptr) &
+           (kCommandBufferEntrySize - 1)));
+
   shared_memory_bytes_allocated_ += size;
   TRACE_COUNTER_ID1(
       "gpu", "GpuTransferBufferMemory", this, shared_memory_bytes_allocated_);