Let Flash join and be controlled by media session

content/browser/media/pepper/pepper_player_delegate.cc

+// Copyright 2016 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/browser/media/pepper/pepper_player_delegate.h"
+
+#include "content/browser/frame_host/render_frame_host_impl.h"
+#include "content/browser/media/pepper/pepper_web_contents_observer.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/common/frame_messages.h"
+
+namespace content {
+PepperPlayerDelegate::PepperPlayerDelegate(
+    PepperWebContentsObserver* pepper_web_contents_observer,
+    int32_t pp_instance)
+    : pepper_web_contents_observer_(pepper_web_contents_observer),
+      pp_instance_(pp_instance) {}
+
+PepperPlayerDelegate::~PepperPlayerDelegate() {}

[mlamouri (slow - plz ping), 2016/06/23 13:23:19]

`= default;` instead of `{}`

[Zhiqiang Zhang (Slow), 2016/06/24 17:43:20]

Done.

+
+void PepperPlayerDelegate::OnSuspend(int player_id) {
+  DCHECK_EQ(player_id, 0);
+  OnSetVolume(player_id, 0.0f);

[mlamouri (slow - plz ping), 2016/06/23 13:23:20]

0.0f isn't really ducking. Was that intended?

[Zhiqiang Zhang (Slow), 2016/06/24 17:43:20]

Using 0.2f

+}
+
+void PepperPlayerDelegate::OnResume(int player_id) {
+  DCHECK_EQ(player_id, 0);
+  OnSetVolume(player_id, 1.0f);
+}
+
+void PepperPlayerDelegate::OnSetVolumeMultiplier(int player_id,
+                                                 double volume_multiplier) {
+  DCHECK_EQ(player_id, 0);
+  OnSetVolume(player_id, volume_multiplier);
+}
+
+void PepperPlayerDelegate::OnSetVolume(int player_id, double volume) {
+  WebContentsImpl* contents = static_cast<WebContentsImpl*>(
+      pepper_web_contents_observer_->web_contents());
+  pepper_web_contents_observer_->Send(
+      new FrameMsg_SetPepperVolume(contents->GetMainFrame()->routing_id(),
+                                   pp_instance_, volume));
+}
+}