Resize images for hi-dpi based on a custom PNG chunk added by GRIT r78, and roll GRIT r78

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index 28664f9dcc4454d835eec2cb46cd884ab86eb6ef..b63c56c2293cf662569ff8a8c9351ea72555b338 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -350,6 +350,10 @@ void ChromeBrowserMainPartsChromeos::PreProfileInit() {
   // -- This used to be in ChromeBrowserMainParts::PreMainMessageLoopRun()
   // -- immediately before Profile creation().
 
+  // In Aura builds this will initialize ash::Shell. Call it first so that
+  // the device scale factor is available when loading images.

[oshima, 2012/10/10 16:21:28]

// Call it first before performing UI related tasks. For 
// example, the device scale factor must be available before
// loading images.

Please correct Engrish as needed :)

[stevenjb, 2012/10/10 17:07:27]

How this initializes Ash is not entirely obvious, I would recommend:

// This will call ChromeBrowserMainParts::PreProfileInit(), which calls
ChromeBrowserMainExtraPartsAsh::PreProfileInit() which instantiates ash::Shell.
This needs to happen before performing any UI related tasks, e.g. the device
scale factor must be available before loading images.

+  ChromeBrowserMainPartsLinux::PreProfileInit();
+
   // Now that the file thread exists we can record our stats.
   chromeos::BootTimesLoader::Get()->RecordChromeMainStats();

[stevenjb, 2012/10/10 17:07:27]

This should probably still be first.

 
@@ -405,9 +409,6 @@ void ChromeBrowserMainPartsChromeos::PreProfileInit() {
     }
     chromeos::UserManager::Get()->SessionStarted();
   }
-
-  // In Aura builds this will initialize ash::Shell.
-  ChromeBrowserMainPartsLinux::PreProfileInit();
 }
 
 void ChromeBrowserMainPartsChromeos::PostProfileInit() {