Tabs being screen-captured will fullscreen within their tab contents area.

chrome/browser/ui/fullscreen/fullscreen_controller_state_test.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/fullscreen/fullscreen_controller_state_test.h"
 
 #include <memory.h>
 
 #include <iomanip>
 #include <iostream>
 
 #include "chrome/browser/fullscreen.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/fullscreen/fullscreen_controller.h"
 #include "chrome/browser/ui/fullscreen/fullscreen_controller_test.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "content/public/browser/web_contents.h"
 #include "content/public/common/url_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_MACOSX)
 #include "base/mac/mac_util.h"
 #endif
 
 namespace {
 
 bool SupportsMacSystemFullscreen() {
@@ skipping 349 matching lines @@
 #if defined(OS_MACOSX)
       if (chrome::mac::SupportsSystemFullscreen()) {
         GetFullscreenController()->ToggleFullscreenWithChrome();
         break;
       }
 #endif
       NOTREACHED() << GetAndClearDebugLog();
       break;
 
     case TAB_FULLSCREEN_TRUE:
-      GetFullscreenController()->ToggleFullscreenModeForTab(
-           GetBrowser()->tab_strip_model()->GetActiveWebContents(), true);
+    case TAB_FULLSCREEN_FALSE: {
+      content::WebContents* const active_tab =
+          GetBrowser()->tab_strip_model()->GetActiveWebContents();
+      GetFullscreenController()->
+          ToggleFullscreenModeForTab(active_tab, event == TAB_FULLSCREEN_TRUE);
+      // Activating/Deactivating tab fullscreen on a captured tab should not
+      // evoke a state change in the browser window.
+      if (active_tab->GetCapturerCount() > 0)
+        state_ = source_state;
       break;
-
-    case TAB_FULLSCREEN_FALSE:
-      GetFullscreenController()->ToggleFullscreenModeForTab(
-           GetBrowser()->tab_strip_model()->GetActiveWebContents(), false);
-      break;
+    }
 
     case METRO_SNAP_TRUE:
 #if defined(OS_WIN)
       GetFullscreenController()->SetMetroSnapMode(true);
 #else
       NOTREACHED() << GetAndClearDebugLog();
 #endif
       break;
 
     case METRO_SNAP_FALSE:
@@ skipping 406 matching lines @@
         << std::right << std::setw(2)
         << info.distance
         << " }, // "
         << GetStateString(state2) << "\n";
     }
     output << "},\n";
   }
   output << "};";
   return output.str();
 }