Enable Per-Monitor Support for Windows 10

chrome/app/chrome_exe_main_win.cc

Index: chrome/app/chrome_exe_main_win.cc
diff --git a/chrome/app/chrome_exe_main_win.cc b/chrome/app/chrome_exe_main_win.cc
index 86677bf87e7255515594a1417cf827e4257dc42f..950df304eb8b48ef4a864b873efc76fe597ac659 100644
--- a/chrome/app/chrome_exe_main_win.cc
+++ b/chrome/app/chrome_exe_main_win.cc
@@ -127,7 +127,11 @@ BOOL SetProcessDPIAwareWrapper() {
 }
 
 void EnableHighDPISupport() {
-  if (!SetProcessDpiAwarenessWrapper(PROCESS_SYSTEM_DPI_AWARE)) {
+  PROCESS_DPI_AWARENESS process_dpi_awareness =
+      base::win::GetVersion() >= base::win::VERSION_WIN10

[scottmg, 2016/06/30 17:06:29]

Why not >= VERSION_WIN8_1? If there's some good reason, a comment here.

[robliao, 2016/06/30 19:53:48]

Done. Add this comment:
  // Enable per-monitor DPI for Win10 or above instead of Win8.1 since Win8.1
  // does not have EnableChildWindowDpiMessage, necessary for correct non-client
  // area scaling across monitors.

+          ? PROCESS_PER_MONITOR_DPI_AWARE
+          : PROCESS_SYSTEM_DPI_AWARE;
+  if (!SetProcessDpiAwarenessWrapper(process_dpi_awareness)) {
     SetProcessDPIAwareWrapper();
   }
 }