Metro/HiDPI: Mark Chrome as HiDPI aware on Windows

With this CL Chrome is marked as HiDPI aware if the enable_hidpi build flag is set.

BUG=114311
TEST=Changed Windows to 2x DPI scale. Ran Chrome. Verified that 2x icons were used.

Review URL: http://codereview.chromium.org/10086009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133826 0039d316-1c4b-4281-b951-d872f2087c98

content/app/content_main_runner.cc

@@ -34,6 +34,7 @@
 #include "sandbox/src/sandbox_types.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/base/ui_base_paths.h"
+#include "ui/base/win/dpi.h"
 #include "webkit/glue/webkit_glue.h"
 
 #if defined(OS_WIN)
@@ -420,6 +421,9 @@ class ContentMainRunnerImpl : public content::ContentMainRunner {
       SendTaskPortToParentProcess();
     }
 #elif defined(OS_WIN)
+#if defined(ENABLE_HIDPI)
+    ui::EnableHighDPISupport();
+#endif
     content::SetupCRT(command_line);
 #endif