Made full screen video with DevTools not flash black on Android.

content/common/gpu/media/android_video_decode_accelerator.cc

 // 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.
 
 #include "content/common/gpu/media/android_video_decode_accelerator.h"
 
 #include <stddef.h>
 
 #include "base/android/build_info.h"
 #include "base/auto_reset.h"
@@ skipping 784 matching lines @@
     const std::vector<media::PictureBuffer>& buffers) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(output_picture_buffers_.empty());
   DCHECK(free_picture_ids_.empty());
 
   if (buffers.size() < kNumPictureBuffers) {
     POST_ERROR(INVALID_ARGUMENT, "Not enough picture buffers assigned.");
     return;
   }
 
+  bool have_context = false;

[DaleCurtis, 2016/03/28 18:02:02]

const bool have_context = make_context_current_.Run() and then check.

[liberato (no reviews please), 2016/03/28 20:58:18]

Done.

+  if ((have_context = make_context_current_.Run()) == false) {
+    LOG(WARNING) << "Failed make GL context current for Assign, continuing.";
+  }
+
   for (size_t i = 0; i < buffers.size(); ++i) {
     if (buffers[i].size() != size_) {
       POST_ERROR(INVALID_ARGUMENT,
                  "Invalid picture buffer size assigned. Wanted "
                      << size_.ToString() << ", but got "
                      << buffers[i].size().ToString());
       return;
     }
     int32_t id = buffers[i].id();
     output_picture_buffers_.insert(std::make_pair(id, buffers[i]));
     free_picture_ids_.push(id);
     // Since the client might be re-using |picture_buffer_id| values, forget
     // about previously-dismissed IDs now.  See ReusePictureBuffer() comment
     // about "zombies" for why we maintain this set in the first place.
     dismissed_picture_ids_.erase(id);
 
-    strategy_->AssignOnePictureBuffer(buffers[i]);
+    strategy_->AssignOnePictureBuffer(buffers[i], have_context);
   }
   TRACE_COUNTER1("media", "AVDA::FreePictureIds", free_picture_ids_.size());
   DoIOTask(true);
 }
 
 void AndroidVideoDecodeAccelerator::ReusePictureBuffer(
     int32_t picture_buffer_id) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // This ReusePictureBuffer() might have been in a pipe somewhere (queued in
@@ skipping 376 matching lines @@
     capabilities.flags = media::VideoDecodeAccelerator::Capabilities::
                              NEEDS_ALL_PICTURE_BUFFERS_TO_DECODE |
                          media::VideoDecodeAccelerator::Capabilities::
                              SUPPORTS_EXTERNAL_OUTPUT_SURFACE;
   }
 
   return capabilities;
 }
 
 }  // namespace content