[PIP] Add picture in picture flag and switch.

chrome/common/chrome_switches.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/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "ppapi/features/features.h"
@@ skipping 362 matching lines @@
 
 // Only auto-reload error pages when the tab is visible.
 const char kEnableOfflineAutoReloadVisibleOnly[] =
     "enable-offline-auto-reload-visible-only";
 
 // Enables permission action reporting to Safe Browsing servers for opted in
 // users.
 const char kEnablePermissionActionReporting[] =
     "enable-permission-action-reporting";
 
+// Enables the picture in picture feature for videos.
+const char kEnablePictureInPicture[] = "enable-picture-in-picture";
+
 // Enables a number of potentially annoying security features (strict mixed
 // content mode, powerful feature restrictions, etc.)
 const char kEnablePotentiallyAnnoyingSecurityFeatures[] =
     "enable-potentially-annoying-security-features";
 
 // Enables the Power overlay in Settings.
 const char kEnablePowerOverlay[]            = "enable-power-overlay";
 
 // Enables showing unregistered printers in print preview
 const char kEnablePrintPreviewRegisterPromos[] =
@@ skipping 797 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR VERY NICE FLAGS TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches