hidpi support for custom cursors in windows

content/common/cursors/webcursor_aura.cc

Index: content/common/cursors/webcursor_aura.cc
diff --git a/content/common/cursors/webcursor_aura.cc b/content/common/cursors/webcursor_aura.cc
index 584ebdfb600f26b2b030284eb189a7648a2a71be..494a42c95d8bc20b5d7d2e751f0ef7340b2e5b0c 100644
--- a/content/common/cursors/webcursor_aura.cc
+++ b/content/common/cursors/webcursor_aura.cc
@@ -7,6 +7,7 @@
 #include "base/logging.h"
 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
 #include "ui/base/cursor/cursor.h"
+#include "ui/base/cursor/cursor_util.h"
 
 using blink::WebCursorInfo;
 
@@ -111,4 +112,26 @@ gfx::NativeCursor WebCursor::GetNativeCursor() {
   }
 }
 
+float WebCursor::GetCursorScaleFactor() {
+  return device_scale_factor_ / custom_scale_;

[ananta, 2015/12/15 23:28:17]

do we need a dcheck for custom_scale_ == 0?

[Bret, 2015/12/16 19:03:59]

Done.

+}
+
+void WebCursor::CreateScaledBitmapAndHotspotFromCustomData(
+    SkBitmap* bitmap,
+    gfx::Point* hotspot) {
+  *hotspot = hotspot_;
+  bitmap->allocN32Pixels(custom_size_.width(), custom_size_.height());
+  memcpy(bitmap->getAddr32(0, 0), custom_data_.data(), custom_data_.size());
+  ui::ScaleAndRotateCursorBitmapAndHotpoint(
+      GetCursorScaleFactor(), gfx::Display::ROTATE_0, bitmap, hotspot);
+}
+
+void WebCursor::SetDisplayInfo(const gfx::Display& display) {
+  if (device_scale_factor_ == display.device_scale_factor())
+    return;
+
+  device_scale_factor_ = display.device_scale_factor();
+  CleanupPlatformData();
+}
+
 }  // namespace content