Add Pepper TrueType font API call to enumerate fonts in a given family.

ppapi/proxy/truetype_font_singleton_resource.h

Index: ppapi/proxy/truetype_font_singleton_resource.h
diff --git a/ppapi/proxy/truetype_font_singleton_resource.h b/ppapi/proxy/truetype_font_singleton_resource.h
index 03c9c7d321717a7be333c3dddb6ca9f07201e337..2a3040c6691b39170c7e04d173bde50234a05ee9 100644
--- a/ppapi/proxy/truetype_font_singleton_resource.h
+++ b/ppapi/proxy/truetype_font_singleton_resource.h
@@ -10,6 +10,7 @@
 
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/serialized_structs.h"
 #include "ppapi/thunk/ppb_truetype_font_singleton_api.h"
 
 namespace ppapi {
@@ -18,8 +19,6 @@ class TrackedCallback;
 
 namespace proxy {
 
-struct SerializedTrueTypeFontDescription;
-
 // This handles the singleton calls (that don't take a PP_Resource parameter)
 // on the TrueType font interface.
 class TrueTypeFontSingletonResource
@@ -38,6 +37,11 @@ class TrueTypeFontSingletonResource
       PP_Instance instance,
       const PP_ArrayOutput& output,
       const scoped_refptr<TrackedCallback>& callback) OVERRIDE;
+  virtual int32_t GetFontsInFamily(
+      PP_Instance instance,
+      PP_Var family,
+      const PP_ArrayOutput& output,
+      const scoped_refptr<TrackedCallback>& callback) OVERRIDE;
 
  private:
   void OnPluginMsgGetFontFamiliesComplete(
@@ -45,6 +49,11 @@ class TrueTypeFontSingletonResource
       PP_ArrayOutput array_output,
       const ResourceMessageReplyParams& params,
       const std::vector<std::string>& data);
+  void OnPluginMsgGetFontsInFamilyComplete(
+      scoped_refptr<TrackedCallback> callback,
+      PP_ArrayOutput array_output,
+      const ResourceMessageReplyParams& params,
+      const std::vector<SerializedTrueTypeFontDesc>& fonts);
 
   DISALLOW_COPY_AND_ASSIGN(TrueTypeFontSingletonResource);
 };