[MediaRouter] Moved the code useful for Android to MediaRouterDialogController

chrome/browser/media/router/media_router_dialog_controller.cc

 // Copyright 2015 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 "chrome/browser/media/router/media_router_dialog_controller.h"
 
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_delegate.h"
+
 #if defined(OS_ANDROID)
 #include "chrome/browser/media/android/router/media_router_dialog_controller_android.h"
 #else
 #include "chrome/browser/ui/webui/media_router/media_router_dialog_controller_impl.h"
 #endif
 
 namespace media_router {
 
 // static
 MediaRouterDialogController*
 MediaRouterDialogController::GetOrCreateForWebContents(
     content::WebContents* contents) {
 #if defined(OS_ANDROID)
   return MediaRouterDialogControllerAndroid::GetOrCreateForWebContents(
       contents);
 #else
   return MediaRouterDialogControllerImpl::GetOrCreateForWebContents(contents);
 #endif
 }
 
+class MediaRouterDialogController::InitiatorWebContentsObserver
+    : public content::WebContentsObserver {
+ public:
+  InitiatorWebContentsObserver(
+      content::WebContents* web_contents,
+      MediaRouterDialogController* dialog_controller)
+      : content::WebContentsObserver(web_contents),
+        dialog_controller_(dialog_controller) {
+    DCHECK(dialog_controller_);
+  }
+
+ private:
+  void WebContentsDestroyed() override {
+    // NOTE: |this| is deleted after CloseMediaRouterDialog() returns.
+    dialog_controller_->CloseMediaRouterDialog();
+  }
+
+  void NavigationEntryCommitted(
+      const content::LoadCommittedDetails& load_details) override {
+    // NOTE: |this| is deleted after CloseMediaRouterDialog() returns.
+    dialog_controller_->CloseMediaRouterDialog();
+  }
+
+  void RenderProcessGone(base::TerminationStatus status) override {
+    // NOTE: |this| is deleted after CloseMediaRouterDialog() returns.
+    dialog_controller_->CloseMediaRouterDialog();
+  }
+
+  MediaRouterDialogController* const dialog_controller_;
+};
+
+MediaRouterDialogController::MediaRouterDialogController(
+    content::WebContents* initiator)
+    : initiator_(initiator) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK(initiator_);
+  initiator_observer_.reset(new InitiatorWebContentsObserver(initiator_, this));
+}
+
+MediaRouterDialogController::~MediaRouterDialogController() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+bool MediaRouterDialogController::ShowMediaRouterDialogForPresentation(
+    scoped_ptr<CreatePresentationSessionRequest> request) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  // Check if the media router dialog exists for |initiator| and return if so.
+  if (IsShowingMediaRouterDialog())
+    return false;
+
+  presentation_request_ = request.Pass();
+  CreateMediaRouterDialog();
+
+  // Show the initiator holding the existing media router dialog.
+  ActivateInitiatorWebContents();
+
+  return true;
+}
+
+bool MediaRouterDialogController::ShowMediaRouterDialog() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  // Don't create dialog if it already exists.
+  bool dialog_needs_creation = !IsShowingMediaRouterDialog();
+  if (dialog_needs_creation)
+    CreateMediaRouterDialog();
+
+  ActivateInitiatorWebContents();
+  return dialog_needs_creation;
+}
+
+void MediaRouterDialogController::HideMediaRouterDialog() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  CloseMediaRouterDialog();
+  Reset();
+}
+
+void MediaRouterDialogController::ActivateInitiatorWebContents() {
+  initiator_->GetDelegate()->ActivateContents(initiator_);
+}
+
+scoped_ptr<CreatePresentationSessionRequest>
+MediaRouterDialogController::PassPresentationRequest() {
+  return presentation_request_.Pass();
+}
+
+void MediaRouterDialogController::Reset() {
+  initiator_observer_.reset();
+  presentation_request_.reset();
+}
+
 }  // namespace media_router