Refactor Windows DPI Point, Rect, and Size for Multiple Monitor DPI Awareness

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index bbb79c967405304c7bb46b1823dfea04d09bf7f0..8caf7bfc01f9f903bf4d721ba90f53bdfd0d7605 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -98,7 +98,7 @@
 #include "content/common/plugin_constants_win.h"
 #include "ui/base/win/hidden_window.h"
 #include "ui/gfx/gdi_util.h"
-#include "ui/gfx/win/dpi.h"
+#include "ui/gfx/screen_win.h"
 #endif
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
@@ -1156,8 +1156,9 @@ void RenderWidgetHostViewAura::UpdateConstrainedWindowRects(
 void RenderWidgetHostViewAura::UpdateMouseLockRegion() {
   // Clip the cursor if chrome is running on regular desktop.
   if (gfx::Screen::GetScreenFor(window_) == gfx::Screen::GetNativeScreen()) {
-    RECT window_rect =
-        gfx::win::DIPToScreenRect(window_->GetBoundsInScreen()).ToRECT();
+    RECT window_rect = gfx::ScreenWin::DIPToScreenRect(
+        window_->GetHost()->GetAcceleratedWidget(),
+        window_->GetBoundsInScreen()).ToRECT();
     ::ClipCursor(&window_rect);
   }
 }
@@ -1236,10 +1237,10 @@ gfx::Rect RenderWidgetHostViewAura::GetBoundsInRootWindow() {
   // TODO(zturner,iyengar): This will break when we remove support for NPAPI and
   // remove the legacy hwnd, so a better fix will need to be decided when that
   // happens.
+  aura::WindowTreeHost* host = top_level->GetHost();
   if (UsesNativeWindowFrame()) {
     // aura::Window doesn't take into account non-client area of native windows
     // (e.g. HWNDs), so for that case ask Windows directly what the bounds are.
-    aura::WindowTreeHost* host = top_level->GetHost();
     if (!host)
       return top_level->GetBoundsInScreen();
     RECT window_rect = {0};
@@ -1260,7 +1261,8 @@ gfx::Rect RenderWidgetHostViewAura::GetBoundsInRootWindow() {
     }
   }
 
-  bounds = gfx::win::ScreenToDIPRect(bounds);
+  bounds = gfx::ScreenWin::ScreenToDIPRect(
+      host ? host->GetAcceleratedWidget() : nullptr, bounds);

[scottmg, 2015/10/28 18:48:21]

What do we do when nullptr?

[robliao, 2015/10/29 00:30:24]

This will tell ScreenToDIPRect to use the nearest monitor to the current rect
instead of the hwnd of the nearest monitor. Since we don't have an HWND, we
don't have a context yet.

 #endif
 
   return bounds;