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 606 matching lines @@
     const CommandLine& browser_cmd,
     CommandLine* renderer_cmd) const {
   // Propagate the following switches to the renderer command line (along
   // with any associated values) if present in the browser command line.
   static const char* const kSwitchNames[] = {
     // We propagate the Chrome Frame command line here as well in case the
     // renderer is not run in the sandbox.
     switches::kAuditAllHandles,
     switches::kAuditHandles,
     switches::kChromeFrame,
+    switches::kDefaultDeviceScaleFactor,
     switches::kDisable3DAPIs,
     switches::kDisableAcceleratedCompositing,
     switches::kDisableApplicationCache,
     switches::kDisableAudio,
     switches::kDisableBreakpad,
 #if defined(OS_MACOSX)
     switches::kDisableCompositedCoreAnimationPlugins,
 #endif
     switches::kDisableDataTransferItems,
     switches::kDisableDatabases,
@@ skipping 10 matching lines @@
     switches::kDisableLogging,
     switches::kDisableSeccompSandbox,
     switches::kDisableSessionStorage,
     switches::kDisableSharedWorkers,
     switches::kDisableSpeechInput,
     switches::kDisableWebAudio,
     switches::kDisableWebSockets,
     switches::kDomAutomationController,
     switches::kEnableAccessibilityLogging,
     switches::kEnableDCHECK,
+    switches::kEnableFixedLayout,
     switches::kEnableGamepad,
     switches::kEnableGPUServiceLogging,
     switches::kEnableGPUClientLogging,
     switches::kEnableLogging,
     switches::kEnableMediaSource,
     switches::kEnableMediaStream,
     switches::kEnableShadowDOM,
     switches::kEnableStrictSiteIsolation,
     switches::kDisableFullScreen,
     switches::kEnablePepperTesting,
@@ skipping 623 matching lines @@
   // Only honor the request if appropriate persmissions are granted.
   if (ChildProcessSecurityPolicyImpl::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);
 }