services/ui: Detect when a video is playing

content/renderer/pepper/pepper_plugin_instance_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/pepper/pepper_plugin_instance_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bit_cast.h"
@@ skipping 2102 matching lines @@
     compositor_layer_ = bound_compositor_->layer();
     web_layer_.reset(new cc_blink::WebLayerImpl(compositor_layer_));
   }
 
   if (web_layer_) {
     if (fullscreen_container_) {
       fullscreen_container_->SetLayer(web_layer_.get());
     } else {
       container_->setWebLayer(web_layer_.get());
     }
+    if (is_flash_plugin_) {
+      web_layer_->ccLayer()->SetMayContainVideo(true);
+    }
   }
 
   layer_bound_to_fullscreen_ = !!fullscreen_container_;
   layer_is_hardware_ = want_3d_layer;
   UpdateLayerTransform();
 }
 
 bool PepperPluginInstanceImpl::PrepareTextureMailbox(
     cc::TextureMailbox* mailbox,
     std::unique_ptr<cc::SingleReleaseCallback>* release_callback,
@@ skipping 1310 matching lines @@
     const cc::TextureMailbox& mailbox) const {
   auto it =
       std::find_if(texture_ref_counts_.begin(), texture_ref_counts_.end(),
                    [&mailbox](const TextureMailboxRefCount& ref_count) {
                      return ref_count.first.mailbox() == mailbox.mailbox();
                    });
   return it != texture_ref_counts_.end();
 }
 
 }  // namespace content