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

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index e49064889c9caa03524c05fcd405ada85195809c..b20aa4b1c496ef46633b7d311477bca9d8b0ab25 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -200,6 +200,10 @@ const char kEnableDNSCertProvenanceChecking[] =
 // Enables device motion events.
 const char kEnableDeviceMotion[]            = "enable-device-motion";
 
+// By default, a page is laid out to fill the entire width of the window.
+// This flag fixes the layout of the page to a default of 980px.
+const char kEnableFixedLayout[]             = "enable-fixed-layout";
+
 // Enable the JavaScript Full Screen API.
 const char kDisableFullScreen[]             = "disable-fullscreen";