Reduce number of active codecs on low end devices.

media/gpu/android_video_decode_accelerator.h

 // Copyright (c) 2013 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.
 
 #ifndef MEDIA_GPU_ANDROID_VIDEO_DECODE_ACCELERATOR_H_
 #define MEDIA_GPU_ANDROID_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 125 matching lines @@
   // Callback that is called when the SurfaceView becomes available, if it's
   // not during Initialize.  |success| is true if it is now available, false
   // if initialization should stop.
   void OnSurfaceAvailable(bool success);
 
   // Initialize of the picture buffer manager.  This is to be called when the
   // SurfaceView in |surface_id_|, if any, is no longer busy.  It will return
   // false on failure, and true if initialization was successful.  This includes
   // synchronous and asynchronous init; the AVDA might not yet have a codec on
   // success, but async init will at least be in progress.
-  bool InitializePictureBufferManager();
+  bool InitializePictureBufferManager(bool force_async_init);

[liberato (no reviews please), 2016/09/13 15:34:28]

i think that it's almost the same if one has InitializePictureBufferManager
check (and clear) |defer_surface_creation_|, rather than take an argument.

[DaleCurtis, 2016/09/15 23:03:55]

Good point. Done.

 
   // A part of destruction process that is sometimes postponed after the drain.
   void ActualDestroy();
 
   // Configures |media_codec_| with the given codec parameters from the client.
   // This configuration will (probably) not be complete before this call
   // returns.  Multiple calls before completion will be ignored.  |state_|
   // must be NO_ERROR or WAITING_FOR_CODEC.  Note that, once you call this,
   // you should be careful to avoid modifying members of |codec_config_| until
   // |state_| is no longer WAITING_FOR_CODEC.
@@ skipping 210 matching lines @@
 
   // True if and only if VDA initialization is deferred, and we have not yet
   // called NotifyInitializationComplete.
   bool deferred_initialization_pending_;
 
   // Indicates if ResetCodecState() should be called upon the next call to
   // Decode(). Allows us to avoid trashing the last few frames of a playback
   // when the EOS buffer is received.
   bool codec_needs_reset_;
 
+  // True if surface creation and |picture_buffer_manager_| initialization has
+  // been defered until the first Decode() call.
+  bool defer_surface_creation_;
+
   // Copy of the VDA::Config we were given.
   Config config_;
 
   OnDestroyingSurfaceCallback on_destroying_surface_cb_;
 
   // WeakPtrFactory for posting tasks back to |this|.
   base::WeakPtrFactory<AndroidVideoDecodeAccelerator> weak_this_factory_;
 
   friend class AndroidVideoDecodeAcceleratorTest;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_GPU_ANDROID_VIDEO_DECODE_ACCELERATOR_H_