cc: Add image decode control in the compositor.

content/renderer/render_thread_impl.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 "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 735 matching lines @@
       base::Bind(&RenderThreadImpl::OnMemoryPressure, base::Unretained(this))));
 
   int num_raster_threads = 0;
   std::string string_value =
       command_line.GetSwitchValueASCII(switches::kNumRasterThreads);
   bool parsed_num_raster_threads =
       base::StringToInt(string_value, &num_raster_threads);
   DCHECK(parsed_num_raster_threads) << string_value;
   DCHECK_GT(num_raster_threads, 0);
 
+#if defined(OS_ANDROID)
   // Note: Currently, enabling image decode tasks only provides a benefit if
-  // there's more than one raster thread. This might change in the future but we
-  // avoid it for now to reduce the cost of recording.
-  are_image_decode_tasks_enabled_ = num_raster_threads > 1;
+  // we use high quality interpolation filters, which are disabled on android.
+  are_image_decode_tasks_enabled_ = false;
+#else
+  are_image_decode_tasks_enabled_ = true;
+#endif
 
   base::SimpleThread::Options thread_options;
 #if defined(OS_ANDROID) || defined(OS_LINUX)
   if (!command_line.HasSwitch(
           switches::kUseNormalPriorityForTileTaskWorkerThreads)) {
     thread_options.set_priority(base::ThreadPriority::BACKGROUND);
   }
 #endif
 
   raster_worker_pool_->Start(num_raster_threads, thread_options);
@@ skipping 1222 matching lines @@
 
 void RenderThreadImpl::ReleaseFreeMemory() {
   base::allocator::ReleaseFreeMemory();
   discardable_shared_memory_manager()->ReleaseFreeMemory();
 
   if (blink_platform_impl_)
     blink::decommitFreeableMemory();
 }
 
 }  // namespace content