Don't capture screenshots for in-page navigations.

content/browser/web_contents/aura/image_window_delegate.cc

Index: content/browser/web_contents/aura/image_window_delegate.cc
diff --git a/content/browser/web_contents/aura/image_window_delegate.cc b/content/browser/web_contents/aura/image_window_delegate.cc
index 0b40c0f090569e899350d13df54827fd2f9e2f7f..ccfd2c5bcb9af9bc7915fe3f6cb9d57201919d78 100644
--- a/content/browser/web_contents/aura/image_window_delegate.cc
+++ b/content/browser/web_contents/aura/image_window_delegate.cc
@@ -66,7 +66,7 @@ void ImageWindowDelegate::OnCaptureLost() {
 
 void ImageWindowDelegate::OnPaint(gfx::Canvas* canvas) {
   if (image_.IsEmpty()) {
-    canvas->DrawColor(SK_ColorGRAY);
+    canvas->DrawColor(SK_ColorWHITE);

[sky, 2014/07/25 22:08:06]

Why are we changing colors?

[mfomitchev, 2014/07/25 22:29:15]

Kuscher asked for this. Testing it out, I agree with him that it does look
better with white for GMail, which is our main concern here.

[sky, 2014/07/25 22:44:49]

Won't this impact *all* sites though? And won't it impact windows? My main
concern here is your desire to merge to 37. I'm fine with landing this on trunk,
but I'm not so happy about the desire to merge to 37 until this shakes out for a
while. How about separating the two patches out?

[mfomitchev, 2014/07/25 23:09:58]

Yes it would. I think it would look better for any site that uses white
background. It would look worse for sites that use gray background. For other
sites I don't think it would make a difference. And there's more sites that use
white background than gray background...
What's your concern with using the white background? 

Either way, I will separate the background patch out.

   } else {
     if (size_mismatch_)
       canvas->DrawColor(SK_ColorWHITE);