Enable SurfaceView fullscreen video on Android with WebMediaPlayerImpl

content/renderer/media/android/renderer_surface_view_manager.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/renderer/media/android/renderer_surface_view_manager.h"
+
+#include "content/common/media/surface_view_manager_messages_android.h"
+#include "ipc/ipc_message_macros.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace content {
+
+RendererSurfaceViewManager::RendererSurfaceViewManager(
+    RenderFrame* render_frame)
+    : RenderFrameObserver(render_frame) {}
+
+RendererSurfaceViewManager::~RendererSurfaceViewManager() {}
+
+bool RendererSurfaceViewManager::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(RendererSurfaceViewManager, msg)
+    IPC_MESSAGE_HANDLER(RendererSurfaceViewManagerMsg_FullscreenSurfaceCreated,
+                        OnFullscreenSurfaceCreated)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void RendererSurfaceViewManager::CreateFullscreenSurface(
+    const gfx::Size& video_natural_size,
+    const media::SurfaceCreatedCB& surface_created_cb) {
+  DCHECK(!surface_created_cb.is_null());

[no sievers, 2016/02/16 19:03:47]

You mean  DCHECK(surface_created_cb.is_null())?

How is it avoided that some other media player tries to enter fullscreen while
another request is pending?

[watk, 2016/02/16 20:04:00]

This is actually DCHECKing the argument, not the member variable.
That's actually OK, but it's not clear. The second player will get the surface.
I added some comments about this to surface_view_manager.h

+  pending_surface_created_cb_ = surface_created_cb;
+  Send(new BrowserSurfaceViewManagerMsg_CreateFullscreenSurface(
+      routing_id(), video_natural_size));
+}
+
+void RendererSurfaceViewManager::NaturalSizeChanged(
+    const gfx::Size& size) {
+  DVLOG(3) << __FUNCTION__ << ": size: " << size.ToString();
+  Send(new BrowserSurfaceViewManagerMsg_NaturalSizeChanged(routing_id(), size));
+}
+
+void RendererSurfaceViewManager::OnFullscreenSurfaceCreated(int surface_id) {
+  DVLOG(3) << __FUNCTION__ << ": surface_id: " << surface_id;
+  DCHECK(!pending_surface_created_cb_.is_null());
+  pending_surface_created_cb_.Run(surface_id);
+  pending_surface_created_cb_.Reset();
+}
+
+}  // namespace content