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

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 761a993bc4877eb4cf93ee44aaa248649d6f8829..b3603f21dd8b2af33d06403698ade2cf693cf2ba 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -87,6 +87,7 @@ RenderWidget::RenderWidget(RenderThreadBase* render_thread,
       popup_type_(popup_type),
       pending_window_rect_count_(0),
       suppress_next_char_events_(false),
+      page_scale_factor_set_(false),
       is_accelerated_compositing_active_(false),
       animation_update_pending_(false),
       animation_task_posted_(false),
@@ -1243,6 +1244,16 @@ webkit::ppapi::PluginInstance* RenderWidget::GetBitmapForOptimizedPluginPaint(
   return NULL;
 }
 
+gfx::Size RenderWidget::GetContentSize() {
+  // Bare RenderWidgets don't support content size.
+  return gfx::Size(0, 0);
+}
+
+float RenderWidget::GetPageScaleFactor() {
+  // Bare RenderWidgets don't support page scale factor.
+  return 1.0f;
+}
+
 gfx::Point RenderWidget::GetScrollOffset() {
   // Bare RenderWidgets don't support scroll offset.
   return gfx::Point(0, 0);