Implement HiDPI support in Pepper dev interface

ppapi/cpp/private/graphics_2d_private.cc

Index: ppapi/cpp/private/graphics_2d_private.cc
diff --git a/ppapi/cpp/private/graphics_2d_private.cc b/ppapi/cpp/private/graphics_2d_private.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4caa91fd4318d09eb7bfc692faf5fc44409db090
--- /dev/null
+++ b/ppapi/cpp/private/graphics_2d_private.cc
@@ -0,0 +1,67 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ppapi/cpp/private/graphics_2d_private.h"
+
+#include "ppapi/c/private/ppb_graphics_2d_private.h"
+#include "ppapi/cpp/module_impl.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_Graphics2D_Private_0_1>() {
+  return PPB_GRAPHICS2D_PRIVATE_INTERFACE_0_1;
+}
+
+}  // namespace
+
+Graphics2DPrivate::Graphics2DPrivate()
+    : Graphics2D(),
+      scale_(1.0f) {
+}
+
+Graphics2DPrivate::Graphics2DPrivate(const Graphics2DPrivate& other)
+    : Graphics2D(other),
+      scale_(other.scale_) {
+}
+
+Graphics2DPrivate::Graphics2DPrivate(const InstanceHandle& instance,
+                                     const Size& size,
+                                     bool is_always_opaque)
+    : Graphics2D(instance, size, is_always_opaque),
+      scale_(1.0f) {
+}
+
+Graphics2DPrivate::Graphics2DPrivate(const InstanceHandle& instance,
+                                     const Size& size,
+                                     bool is_always_opaque,
+                                     float scale)
+    : Graphics2D(),
+      scale_(1.0f) {
+  if (!has_interface<PPB_Graphics2D_Private_0_1>())
+    return;
+  PassRefFromConstructor(get_interface<PPB_Graphics2D_Private_0_1>()->Create(
+      instance.pp_instance(),
+      &size.pp_size(),
+      PP_FromBool(is_always_opaque),
+      scale));
+  if (!is_null()) {
+    // Only save size and scale if allocation succeeded
+    size_ = size;
+    scale_ = scale;
+  }
+}
+
+Graphics2DPrivate::~Graphics2DPrivate() {
+}
+
+Graphics2DPrivate& Graphics2DPrivate::operator=(const Graphics2DPrivate& other)
+{
+  Graphics2D::operator=(other);
+  scale_ = other.scale_;
+  return *this;
+}
+
+}  // namespace pp