Add DeviceDisplayInfo getter in WindowAndroid.

ui/snapshot/snapshot_android.cc

Index: ui/snapshot/snapshot_android.cc
diff --git a/ui/snapshot/snapshot_android.cc b/ui/snapshot/snapshot_android.cc
index fb7d40d47a6d1c22c71e6abbda1cdb0fe0e969ee..33e5a027347dd7949ab1a0e0b2aeddfd06a92b51 100644
--- a/ui/snapshot/snapshot_android.cc
+++ b/ui/snapshot/snapshot_android.cc
@@ -12,6 +12,7 @@
 #include "ui/android/view_android.h"
 #include "ui/android/window_android.h"
 #include "ui/android/window_android_compositor.h"
+#include "ui/gfx/android/device_display_info.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/point_conversions.h"
 #include "ui/gfx/geometry/rect_conversions.h"
@@ -41,8 +42,11 @@ static void MakeAsyncCopyRequest(
   scoped_ptr<cc::CopyOutputRequest> request =
       cc::CopyOutputRequest::CreateBitmapRequest(callback);
 
-  const gfx::Display& display = gfx::Screen::GetScreen()->GetPrimaryDisplay();
-  float device_scale_factor = display.device_scale_factor();
+  float device_scale_factor =
+      gfx::Display::HasForceDeviceScaleFactor()
+          ? gfx::Display::GetForcedDeviceScaleFactor()
+          : window->GetDeviceDisplayInfo().GetDIPScale();
+
   gfx::Rect source_rect_in_pixel =
       gfx::ScaleToEnclosingRect(source_rect, device_scale_factor);