gpu: Add async pixel transfer interface, stub and tests.

gpu/command_buffer/service/common_decoder.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/common_decoder.h"
 #include "gpu/command_buffer/service/cmd_buffer_engine.h"
 
 namespace gpu {
 
 CommonDecoder::Bucket::Bucket() : size_(0) {}
@@ skipping 55 matching lines @@
   Buffer buffer = engine_->GetSharedMemoryBuffer(shm_id);
   if (!buffer.ptr)
     return NULL;
   unsigned int end = offset + size;
   if (end > buffer.size || end < offset) {
     return NULL;
   }
   return static_cast<int8*>(buffer.ptr) + offset;
 }
 
+Buffer CommonDecoder::GetSharedMemoryBuffer(unsigned int shm_id) {
+  return engine_->GetSharedMemoryBuffer(shm_id);
+}
+
 bool CommonDecoder::PushAddress(uint32 offset) {
   if (call_stack_.size() < kMaxStackDepth) {
     CommandAddress return_address(engine_->GetGetOffset());
     if (engine_->SetGetOffset(offset)) {
       call_stack_.push(return_address);
       return true;
     }
   }
   return false;
 }
@@ skipping 253 matching lines @@
   }
   const void* src = bucket->GetData(offset, size);
   if (!src) {
       return error::kInvalidArguments;
   }
   memcpy(data, src, size);
   return error::kNoError;
 }
 
 }  // namespace gpu