Pass DefaultDeviceScaleFactor to webkit

DefaultDeviceScaleFactor will be based solely on the screen DPI, as opposed to DeviceScaleFactor,
which incorporates information from the viewport tag.

This is a follow-up to: https://bugs.webkit.org/show_bug.cgi?id=79534

BUG=115231
TEST=None

Review URL: http://codereview.chromium.org/9500015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124411 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/render_process_host_impl.cc

@@ -649,7 +649,6 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kAuditAllHandles,
     switches::kAuditHandles,
     switches::kChromeFrame,
-    switches::kDefaultDeviceScaleFactor,
     switches::kDisable3DAPIs,
     switches::kDisableAcceleratedCompositing,
     switches::kDisableApplicationCache,

content/browser/tab_contents/tab_contents.cc

@@ -10,6 +10,7 @@
 #include "base/metrics/histogram.h"
 #include "base/metrics/stats_counters.h"
 #include "base/string16.h"
+#include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
@@ -460,6 +461,13 @@ WebPreferences TabContents::GetWebkitPrefs(RenderViewHost* rvh,
     prefs.accelerated_2d_canvas_enabled = false;
   }
 
+  int default_device_scale_factor;
+  base::StringToInt(command_line.GetSwitchValueASCII(
+                        switches::kDefaultDeviceScaleFactor),
+                    &default_device_scale_factor);
+
+  prefs.default_device_scale_factor = default_device_scale_factor;
+
   content::GetContentClient()->browser()->OverrideWebkitPrefs(rvh, &prefs);
 
   return prefs;

content/common/view_messages.h

@@ -140,6 +140,7 @@ IPC_STRUCT_TRAITS_BEGIN(WebPreferences)
   IPC_STRUCT_TRAITS_MEMBER(fantasy_font_family_map)
   IPC_STRUCT_TRAITS_MEMBER(default_font_size)
   IPC_STRUCT_TRAITS_MEMBER(default_fixed_font_size)
+  IPC_STRUCT_TRAITS_MEMBER(default_device_scale_factor)
   IPC_STRUCT_TRAITS_MEMBER(minimum_font_size)
   IPC_STRUCT_TRAITS_MEMBER(minimum_logical_font_size)
   IPC_STRUCT_TRAITS_MEMBER(default_encoding)

content/renderer/render_view_impl.cc

@@ -540,9 +540,6 @@ RenderViewImpl::RenderViewImpl(
   webview()->enableFixedLayoutMode(enable_fixed_layout);
   if (enable_fixed_layout)
       webview()->settings()->setFixedElementsLayoutRelativeToFrame(true);
-  base::StringToInt(command_line.GetSwitchValueASCII(
-                        switches::kDefaultDeviceScaleFactor),
-                    &default_device_scale_factor_);
 
   content::GetContentClient()->renderer()->RenderViewCreated(this);
 }
@@ -4417,9 +4414,9 @@ void RenderViewImpl::OnResize(const gfx::Size& new_size,
                               bool is_fullscreen) {
   if (webview()) {
     // This setting has no effect if fixed layout is not enabled.
-    if (default_device_scale_factor_)
+    if (webkit_preferences_.default_device_scale_factor)
       webview()->settings()->setLayoutFallbackWidth(
-          new_size.width() / default_device_scale_factor_);
+          new_size.width() / webkit_preferences_.default_device_scale_factor);
     webview()->hidePopups();
     if (send_preferred_size_changes_) {
       webview()->mainFrame()->setCanHaveScrollbars(

content/renderer/render_view_impl.h

@@ -1020,8 +1020,6 @@ class RenderViewImpl : public RenderWidget,
   // should be drawn.
   gfx::Size disable_scrollbars_size_limit_;
 
-  int default_device_scale_factor_;
-
   // Loading state -------------------------------------------------------------
 
   // True if the top level frame is currently being loaded.

webkit/glue/webpreferences.cc

@@ -36,6 +36,7 @@ WebPreferences::WebPreferences()
       default_fixed_font_size(13),
       minimum_font_size(0),
       minimum_logical_font_size(6),
+      default_device_scale_factor(1),
       default_encoding("ISO-8859-1"),
       javascript_enabled(true),
       web_security_enabled(true),
@@ -186,6 +187,7 @@ void WebPreferences::Apply(WebView* web_view) const {
   settings->setDefaultFixedFontSize(default_fixed_font_size);
   settings->setMinimumFontSize(minimum_font_size);
   settings->setMinimumLogicalFontSize(minimum_logical_font_size);
+  settings->setDefaultDeviceScaleFactor(default_device_scale_factor);
   settings->setDefaultTextEncodingName(ASCIIToUTF16(default_encoding));
   settings->setJavaScriptEnabled(javascript_enabled);
   settings->setWebSecurityEnabled(web_security_enabled);

webkit/glue/webpreferences.h

@@ -43,6 +43,7 @@ struct WEBKIT_GLUE_EXPORT WebPreferences {
   int default_fixed_font_size;
   int minimum_font_size;
   int minimum_logical_font_size;
+  int default_device_scale_factor;
   std::string default_encoding;
   bool javascript_enabled;
   bool web_security_enabled;