Implement HiDPI support in Pepper dev interface

ppapi/thunk/ppb_view_thunk.cc

Index: ppapi/thunk/ppb_view_thunk.cc
diff --git a/ppapi/thunk/ppb_view_thunk.cc b/ppapi/thunk/ppb_view_thunk.cc
index 874513b6b30d7e5e3f71438e4af77594ef38e9f0..3aad4ec71e8332126e326d23fe7fd27703e37def 100644
--- a/ppapi/thunk/ppb_view_thunk.cc
+++ b/ppapi/thunk/ppb_view_thunk.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "ppapi/c/ppb_view.h"
+#include "ppapi/c/private/ppb_view_private.h"
 #include "ppapi/shared_impl/ppb_view_shared.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_view_api.h"
@@ -77,6 +78,22 @@ PP_Bool GetClipRect(PP_Resource resource, PP_Rect* clip) {
   return PP_TRUE;
 }
 
+PP_Bool GetDeviceScale(PP_Resource resource, float* device_scale) {
+  EnterView enter(resource, true);
+  if (enter.failed() || !device_scale)
+    return PP_FALSE;
+  *device_scale = enter.object()->GetData().device_scale;
+  return PP_TRUE;
+}
+
+PP_Bool GetCSSScale(PP_Resource resource, float* css_scale) {
+  EnterView enter(resource, true);
+  if (enter.failed() || !css_scale)
+    return PP_FALSE;
+  *css_scale = enter.object()->GetData().css_scale;
+  return PP_TRUE;
+}
+
 const PPB_View g_ppb_view_thunk = {
   &IsView,
   &GetRect,
@@ -86,11 +103,20 @@ const PPB_View g_ppb_view_thunk = {
   &GetClipRect
 };
 
+const PPB_View_Private g_ppb_view_private_thunk = {
+  &GetDeviceScale,
+  &GetCSSScale
+};
+
 }  // namespace
 
 const PPB_View* GetPPB_View_1_0_Thunk() {
   return &g_ppb_view_thunk;
 }
 
+const PPB_View_Private* GetPPB_View_Private_0_1_Thunk() {
+  return &g_ppb_view_private_thunk;
+}
+
 }  // namespace thunk
 }  // namespace ppapi