Added Pepper 3D render context that instantiates the GPU plugin....

gpu/command_buffer/service/common_decoder.cc

Index: gpu/command_buffer/service/common_decoder.cc
===================================================================
--- gpu/command_buffer/service/common_decoder.cc	(revision 35153)
+++ gpu/command_buffer/service/common_decoder.cc	(working copy)
@@ -35,14 +35,14 @@
 void* CommonDecoder::GetAddressAndCheckSize(unsigned int shm_id,
                                             unsigned int offset,
                                             unsigned int size) {
-  void* shm_addr = engine_->GetSharedMemoryAddress(shm_id);
-  if (!shm_addr) return NULL;
-  size_t shm_size = engine_->GetSharedMemorySize(shm_id);
+  Buffer buffer = engine_->GetSharedMemoryBuffer(shm_id);
+  if (!buffer.ptr)
+    return NULL;
   unsigned int end = offset + size;
-  if (end > shm_size || end < offset) {
+  if (end > buffer.size || end < offset) {
     return NULL;
   }
-  return static_cast<int8 *>(shm_addr) + offset;
+  return static_cast<int8*>(buffer.ptr) + offset;
 }
 
 const char* CommonDecoder::GetCommonCommandName(