Mojo multiple command buffer support and sample

mojo/gles2/command_buffer_client_impl.cc

Index: mojo/gles2/command_buffer_client_impl.cc
diff --git a/mojo/gles2/command_buffer_client_impl.cc b/mojo/gles2/command_buffer_client_impl.cc
index 84c67ab3be5251f3bad286a37a8c56d92d3c3f94..233573fc2835bf789e1b168159b333758e021a57 100644
--- a/mojo/gles2/command_buffer_client_impl.cc
+++ b/mojo/gles2/command_buffer_client_impl.cc
@@ -208,14 +208,14 @@ void CommandBufferClientImpl::DestroyGpuMemoryBuffer(int32 id) {
 }
 
 uint32 CommandBufferClientImpl::InsertSyncPoint() {
-  // TODO(piman)
-  NOTIMPLEMENTED();
+  // TODO(jamesr): Optimize this.
+  WaitForGetOffsetInRange(last_put_offset_, last_put_offset_);
   return 0;
 }
 
 uint32 CommandBufferClientImpl::InsertFutureSyncPoint() {
-  // TODO(piman)
-  NOTIMPLEMENTED();
+  // TODO(jamesr): Optimize this.
+  WaitForGetOffsetInRange(last_put_offset_, last_put_offset_);
   return 0;
 }