Consistently use LoFi for an entire page

chrome/renderer/page_load_histograms.h

Index: chrome/renderer/page_load_histograms.h
diff --git a/chrome/renderer/page_load_histograms.h b/chrome/renderer/page_load_histograms.h
index 39f8cc5a9cb8c75d3d70b7dbaa4f5d0c9c38cfc2..bc8beb2b18e414f8c4374d9758182849dfc2619e 100644
--- a/chrome/renderer/page_load_histograms.h
+++ b/chrome/renderer/page_load_histograms.h
@@ -24,11 +24,13 @@ class PageLoadHistograms : public content::RenderViewObserver {
 
  private:
   // RenderViewObserver implementation.
-  void FrameWillClose(blink::WebFrame* frame) override;
-  void ClosePage() override;
+  void FrameWillClose(blink::WebFrame* frame, bool lofi_used) override;
+  void ClosePage(bool lofi_used) override;
   void DidUpdateLayout() override;
 
   // Dump all page load histograms appropriate for the given frame.
+  // Dump page load histograms that report whether or not the frame request was
+  // for a Lo-Fi version of the resource with the given |lofi_used|.
   //
   // This method will only dump once-per-instance, so it is safe to call
   // multiple times.
@@ -47,7 +49,7 @@ class PageLoadHistograms : public content::RenderViewObserver {
   // redirect had been done (the user never requested the page)
   // Also, it's possible to load a page without ever laying it out
   // so first_paint and first_paint_after_load can be 0.
-  void Dump(blink::WebFrame* frame);
+  void Dump(blink::WebFrame* frame, bool lofi_used);
 
   bool ShouldDump(blink::WebFrame* frame);
   void MaybeDumpFirstLayoutHistograms();