Fix scroll restoration when exiting fullscreen mode.

chrome/browser/ui/exclusive_access/fullscreen_controller.cc

 // Copyright (c) 2012 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/ui/exclusive_access/fullscreen_controller.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 254 matching lines @@
 
   content::RenderWidgetHostView* const current_fs_view =
       old_contents->GetFullscreenRenderWidgetHostView();
   if (current_fs_view)
     current_fs_view->SetSize(old_contents->GetPreferredSize());
   ResizeWebContents(old_contents, old_contents->GetPreferredSize());
 }
 
 void FullscreenController::OnTabClosing(WebContents* web_contents) {
   if (IsFullscreenForCapturedTab(web_contents)) {
-    web_contents->ExitFullscreen();
+    web_contents->ExitFullscreen(IsFullscreenCausedByTab());

[scheib, 2016/01/04 22:26:48]

For readability please use the pattern you used below, with the local variable
will_cause_resize.

[bokan, 2016/01/05 15:37:11]

Done.

   } else {
     ExclusiveAccessControllerBase::OnTabClosing(web_contents);
   }
 }
 
 void FullscreenController::WindowFullscreenStateChanged() {
   reentrant_window_state_change_call_check_ = true;
   ExclusiveAccessContext* const exclusive_access_context =
       exclusive_access_manager()->context();
   bool exiting_fullscreen = !exclusive_access_context->IsFullscreen();
 
   PostFullscreenChangeNotification(!exiting_fullscreen);
   if (exiting_fullscreen) {
     toggled_into_fullscreen_ = false;
     extension_caused_fullscreen_ = GURL();
     NotifyTabExclusiveAccessLost();
     exclusive_access_context->UnhideDownloadShelf();
   } else {
     exclusive_access_context->HideDownloadShelf();
   }
 }
 
 bool FullscreenController::HandleUserPressedEscape() {
   WebContents* const active_web_contents =
       exclusive_access_manager()->context()->GetActiveWebContents();
   if (IsFullscreenForCapturedTab(active_web_contents)) {
-    active_web_contents->ExitFullscreen();
+    active_web_contents->ExitFullscreen(IsFullscreenCausedByTab());

[scheib, 2016/01/04 22:26:48]

For readability please use the pattern you used below, with the local variable
will_cause_resize.

[bokan, 2016/01/05 15:37:11]

Done.

     return true;
   } else if (IsWindowFullscreenForTabOrPending()) {
     ExitExclusiveAccessIfNecessary();
     return true;
   }
 
   return false;
 }
 
 void FullscreenController::ExitExclusiveAccessToPreviousState() {
@@ skipping 88 matching lines @@
       chrome::NOTIFICATION_FULLSCREEN_CHANGED,
       content::Source<FullscreenController>(this),
       content::Details<bool>(&is_fullscreen));
 }
 
 void FullscreenController::NotifyTabExclusiveAccessLost() {
   if (exclusive_access_tab()) {
     WebContents* web_contents = exclusive_access_tab();
     SetTabWithExclusiveAccess(nullptr);
     fullscreened_origin_ = GURL();
+    bool will_cause_resize = IsFullscreenCausedByTab();
     state_prior_to_tab_fullscreen_ = STATE_INVALID;
     tab_fullscreen_accepted_ = false;
-    web_contents->ExitFullscreen();
+    web_contents->ExitFullscreen(will_cause_resize);
     exclusive_access_manager()->UpdateExclusiveAccessExitBubbleContent();
   }
 }
 
 void FullscreenController::ToggleFullscreenModeInternal(
     FullscreenInternalOption option) {
 #if defined(OS_WIN)
   // When in Metro snap mode, toggling in and out of fullscreen is prevented.
   if (IsInMetroSnapMode())
     return;
@@ skipping 172 matching lines @@
     return fullscreened_origin_;
 
   return exclusive_access_tab()->GetLastCommittedURL();
 }
 
 GURL FullscreenController::GetEmbeddingOrigin() const {
   DCHECK(exclusive_access_tab());
 
   return exclusive_access_tab()->GetLastCommittedURL();
 }