Disable Screen Orientation API locking ability for WebView.

content/browser/browser_main_loop.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 "content/browser/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 548 matching lines @@
     InitStartupTracing(parsed_command_line_);
   }
 #endif  // !defined(OS_IOS)
 
 #if defined(OS_ANDROID)
   {
     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
     SurfaceTextureManager::InitInstance(new BrowserSurfaceTextureManager);
   }
 
-  {
+  if (!parsed_command_line_.HasSwitch(
+      switches::kDisableScreenOrientationLock)) {
     TRACE_EVENT0("startup",
                  "BrowserMainLoop::Subsystem:ScreenOrientationProvider");
     screen_orientation_delegate_.reset(
         new ScreenOrientationDelegateAndroid());
     ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
   }
 #endif
 
   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
@@ skipping 694 matching lines @@
 
 void BrowserMainLoop::EndStartupTracing() {
   is_tracing_startup_ = false;
   TracingController::GetInstance()->DisableRecording(
       TracingController::CreateFileSink(
           startup_trace_file_,
           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
 }
 
 }  // namespace content