Compute pageScaleFactor on page so that fixed layout page fits width of window.

content/browser/renderer_host/render_process_host_impl.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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #if defined(OS_WIN)
@@ skipping 639 matching lines @@
     switches::kDisableLocalStorage,
     switches::kDisableLogging,
     switches::kDisableSeccompSandbox,
     switches::kDisableSessionStorage,
     switches::kDisableSharedWorkers,
     switches::kDisableSpeechInput,
     switches::kDisableWebAudio,
     switches::kDisableWebSockets,
     switches::kEnableAccessibilityLogging,
     switches::kEnableDCHECK,
+    switches::kEnableFixedLayout,
     switches::kEnableGamepad,
     switches::kEnableGPUServiceLogging,
     switches::kEnableGPUClientLogging,
     switches::kEnableIndexedDBForWorkers,
     switches::kEnableLogging,
     switches::kEnableMediaSource,
     switches::kEnableMediaStream,
     switches::kEnableStrictSiteIsolation,
     switches::kDisableFullScreen,
     switches::kEnablePepperTesting,
@@ skipping 631 matching lines @@
 void RenderProcessHostImpl::OnRevealFolderInOS(const FilePath& path) {
   // Only honor the request if appropriate persmissions are granted.
   if (ChildProcessSecurityPolicy::GetInstance()->CanReadFile(GetID(), path))
     content::GetContentClient()->browser()->OpenItem(path);
 }
 
 void RenderProcessHostImpl::OnSavedPageAsMHTML(int job_id, int64 data_size) {
   content::GetContentClient()->browser()->GetMHTMLGenerationManager()->
       MHTMLGenerated(job_id, data_size);
 }