Implement WMPI suspend/resume.

With this change, WMPI translates WasShown()/WasHidden() on
RenderFrameImpl to pipeline Suspend()/Resume().

BUG=516850

Review URL: https://codereview.chromium.org/1473733002

Cr-Commit-Position: refs/heads/master@{#364854}

2 files changed, 24 insertions, 0 deletions

diff --git a/content/renderer/media/renderer_webmediaplayer_delegate.cc b/content/renderer/media/renderer_webmediaplayer_delegate.cc
index e573107..e811655 100644
--- a/content/renderer/media/renderer_webmediaplayer_delegate.cc
+++ b/content/renderer/media/renderer_webmediaplayer_delegate.cc
@@ -31,4 +31,20 @@ void RendererWebMediaPlayerDelegate::PlayerGone(blink::WebMediaPlayer* player) {
   DidPause(player);
 }
 
+void RendererWebMediaPlayerDelegate::AddObserver(Observer* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void RendererWebMediaPlayerDelegate::RemoveObserver(Observer* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
+void RendererWebMediaPlayerDelegate::WasHidden() {
+  FOR_EACH_OBSERVER(Observer, observer_list_, OnHidden());
+}
+
+void RendererWebMediaPlayerDelegate::WasShown() {
+  FOR_EACH_OBSERVER(Observer, observer_list_, OnShown());
+}
+
 }  // namespace media
diff --git a/content/renderer/media/renderer_webmediaplayer_delegate.h b/content/renderer/media/renderer_webmediaplayer_delegate.h
index 76a6686..0033aad 100644
--- a/content/renderer/media/renderer_webmediaplayer_delegate.h
+++ b/content/renderer/media/renderer_webmediaplayer_delegate.h
@@ -7,6 +7,7 @@
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "media/blink/webmediaplayer_delegate.h"
 
@@ -33,9 +34,16 @@ class RendererWebMediaPlayerDelegate
   void DidPlay(blink::WebMediaPlayer* player) override;
   void DidPause(blink::WebMediaPlayer* player) override;
   void PlayerGone(blink::WebMediaPlayer* player) override;
+  void AddObserver(Observer* observer) override;
+  void RemoveObserver(Observer* observer) override;
+
+  // content::RenderFrameObserver overrides.
+  void WasHidden() override;
+  void WasShown() override;
 
  private:
   bool has_played_media_ = false;
+  base::ObserverList<Observer> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererWebMediaPlayerDelegate);
 };