Add a query function for the scaling feature.

We need to be able to query whether scaling is supported before creating a
Graphics2D object so we know which code path to use. This just adds a function
to do that checking.

I also renamed Graphics2DDev to Graphics2D_Dev for consistency with the other
Dev wrapper objects.

TEST=none
BUG=none

Review URL: https://chromiumcodereview.appspot.com/10832428

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152829 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 15 insertions, 7 deletions

diff --git a/ppapi/cpp/dev/graphics_2d_dev.cc b/ppapi/cpp/dev/graphics_2d_dev.cc
index 1a04b6a..e141bb6 100644
--- a/ppapi/cpp/dev/graphics_2d_dev.cc
+++ b/ppapi/cpp/dev/graphics_2d_dev.cc
@@ -17,14 +17,19 @@ template <> const char* interface_name<PPB_Graphics2D_Dev>() {
 
 }  // namespace
 
-bool Graphics2DDev::SetScale(float scale) {
+// static
+bool Graphics2D_Dev::SupportsScale() {
+  return has_interface<PPB_Graphics2D_Dev>();
+}
+
+bool Graphics2D_Dev::SetScale(float scale) {
   if (!has_interface<PPB_Graphics2D_Dev>())
     return false;
   return PP_ToBool(get_interface<PPB_Graphics2D_Dev>()->SetScale(pp_resource(),
                                                                  scale));
 }
 
-float Graphics2DDev::GetScale() {
+float Graphics2D_Dev::GetScale() {
   if (!has_interface<PPB_Graphics2D_Dev>())
     return 1.0f;
   return get_interface<PPB_Graphics2D_Dev>()->GetScale(pp_resource());
diff --git a/ppapi/cpp/dev/graphics_2d_dev.h b/ppapi/cpp/dev/graphics_2d_dev.h
index 2ebc06e..3dc8c71 100644
--- a/ppapi/cpp/dev/graphics_2d_dev.h
+++ b/ppapi/cpp/dev/graphics_2d_dev.h
@@ -11,17 +11,20 @@ namespace pp {
 
 // Graphics2DDev is a version of Graphics2D that exposes under-development  APIs
 // for HiDPI
-class Graphics2DDev : public Graphics2D {
+class Graphics2D_Dev : public Graphics2D {
  public:
   /// Default constructor for creating an is_null()
-  /// <code>Graphics2DDev</code> object.
-  Graphics2DDev() : Graphics2D() {}
+  /// <code>Graphics2D_Dev</code> object.
+  Graphics2D_Dev() : Graphics2D() {}
 
   // Constructor for creating a <code>Graphics2DDev</code> object from an
   // existing <code>Graphics2D</code> object.
-  Graphics2DDev(const Graphics2D& other) : Graphics2D(other) {}
+  Graphics2D_Dev(const Graphics2D& other) : Graphics2D(other) {}
 
-  virtual ~Graphics2DDev() {}
+  virtual ~Graphics2D_Dev() {}
+
+  /// Returns true if SetScale and GetScale are supported. False if not.
+  static bool SupportsScale();
 
   /// SetScale() sets the scale factor that will be applied when painting the
   /// graphics context onto the output device. Typically, if rendering at device