[Presentation API] 1-UA presentation support + presenter APIs.

chrome/browser/extensions/api/tab_capture/offscreen_presentation.h

Index: chrome/browser/extensions/api/tab_capture/offscreen_presentation.h
diff --git a/chrome/browser/extensions/api/tab_capture/offscreen_presentation.h b/chrome/browser/extensions/api/tab_capture/offscreen_presentation.h
index 03ca5c22810b3cbf2daf8cb9073895912bec0fe8..4bb66085265fa0f4567de7010bdbc867fba5f0c1 100644
--- a/chrome/browser/extensions/api/tab_capture/offscreen_presentation.h
+++ b/chrome/browser/extensions/api/tab_capture/offscreen_presentation.h
@@ -18,6 +18,10 @@
 
 class Profile;
 
+namespace media_router {
+class OffscreenPresentationManager;
+}
+
 namespace extensions {
 
 class OffscreenPresentation;  // Forward declaration.  See below.
@@ -178,6 +182,15 @@ class OffscreenPresentation : protected content::WebContentsDelegate,
   // OffscreenPresentation when the capturer count returns to zero.
   void DieIfContentCaptureEnded();
 
+  // Unregisters this presentation from OffscreenPresentationManager and
+  // destroys it.
+  void Destroy();
+
+  // Gets the OffscreenPresentationManager instance associated with the

[miu, 2015/09/27 00:22:08]

To be consistent with the naming and comments in the rest of this module, could
you make this comment read:

  // Gets the OPM instance associated with the extension's BrowserContext.

[imcheng, 2015/09/30 01:13:41]

Code removed.

+  // presentation
+  // controller's BrowserContext.
+  media_router::OffscreenPresentationManager* GetOffscreenPresentationManager();
+
   OffscreenPresentationsOwner* const owner_;
 
   // The starting URL for this presentation, which may or may not match the