PPAPI: Make GLES2 calls resilient to bad/dead resources.

ppapi/proxy/ppapi_command_buffer_proxy.cc

Index: ppapi/proxy/ppapi_command_buffer_proxy.cc
diff --git a/ppapi/proxy/ppapi_command_buffer_proxy.cc b/ppapi/proxy/ppapi_command_buffer_proxy.cc
index 8ca17e442d1e20b7b6f2d70b25c3e6caaa8269d8..8472acefff11b57d992e031d3a838a39c20a80f9 100644
--- a/ppapi/proxy/ppapi_command_buffer_proxy.cc
+++ b/ppapi/proxy/ppapi_command_buffer_proxy.cc
@@ -74,14 +74,10 @@ gpu::CommandBuffer::State PpapiCommandBufferProxy::GetState() {
 }
 
 gpu::CommandBuffer::State PpapiCommandBufferProxy::GetLastState() {
-  // Note: The locking command buffer wrapper does not take a global lock before
-  // calling this function.

[dmichael (off chromium), 2013/09/25 20:05:13]

I can't find where the GetLastState actually gets called from...  can you help
me understand where, so I can make sure we're doing the right thing? As far as I
can tell, though, we can't get here without acquiring the ProxyLock.

   return last_state_;
 }
 
 int32 PpapiCommandBufferProxy::GetLastToken() {
-  // Note: The locking command buffer wrapper does not take a global lock before
-  // calling this function.
   return last_state_.token;
 }