Implement HiDPI support in Pepper dev interface

ppapi/shared_impl/ppb_view_shared.cc

Index: ppapi/shared_impl/ppb_view_shared.cc
diff --git a/ppapi/shared_impl/ppb_view_shared.cc b/ppapi/shared_impl/ppb_view_shared.cc
index 1e024a69000325edc80f9653ae4872a0d5d3bebb..198ff8faa38a5c31eab3cdde6a21f824cabbfeff 100644
--- a/ppapi/shared_impl/ppb_view_shared.cc
+++ b/ppapi/shared_impl/ppb_view_shared.cc
@@ -9,6 +9,8 @@ namespace ppapi {
 ViewData::ViewData() {
   // Assume POD.
   memset(this, 0, sizeof(ViewData));
+  device_scale = 1.0;
+  css_scale = 1.0;
 }
 
 ViewData::~ViewData() {
@@ -24,7 +26,9 @@ bool ViewData::Equals(const ViewData& other) const {
          clip_rect.point.x == other.clip_rect.point.x &&
          clip_rect.point.y == other.clip_rect.point.y &&
          clip_rect.size.width == other.clip_rect.size.width &&
-         clip_rect.size.height == other.clip_rect.size.height;
+         clip_rect.size.height == other.clip_rect.size.height &&
+         device_scale == other.device_scale &&
+         css_scale == other.css_scale;
 }
 
 PPB_View_Shared::PPB_View_Shared(ResourceObjectType type,