Add Pepper support for several GL extensions

ppapi/lib/gl/gles2/gl2ext_ppapi.c

Index: ppapi/lib/gl/gles2/gl2ext_ppapi.c
diff --git a/ppapi/lib/gl/gles2/gl2ext_ppapi.c b/ppapi/lib/gl/gles2/gl2ext_ppapi.c
index 62d842de402e61c7e16df6ecf587737b2b97a448..394084a9cf4f2566017496e2a3ccc18e1df93feb 100644
--- a/ppapi/lib/gl/gles2/gl2ext_ppapi.c
+++ b/ppapi/lib/gl/gles2/gl2ext_ppapi.c
@@ -26,6 +26,16 @@
 // TODO(alokp): This will need to be thread-safe if we build gles2 as a
 // shared library.
 static const struct PPB_OpenGLES2* g_gles2_interface = NULL;
+static const struct PPB_OpenGLES2InstancedArrays*
+    g_gles2_instanced_arrays_interface = NULL;
+static const struct PPB_OpenGLES2FramebufferBlit*
+    g_gles2_framebuffer_blit_interface = NULL;
+static const struct PPB_OpenGLES2FramebufferMultisample*
+    g_gles2_framebuffer_multisample_interface = NULL;
+static const struct PPB_OpenGLES2ChromiumEnableFeature*
+    g_gles2_chromium_enable_feature_interface = NULL;
+static const struct PPB_OpenGLES2ChromiumMapSub*
+    g_gles2_chromium_map_sub_interface = NULL;
 
 // TODO(alokp): Make sure PP_TLS works on all supported platforms.
 static PP_TLS PP_Resource g_current_context = 0;
@@ -35,6 +45,26 @@ GLboolean GL_APIENTRY glInitializePPAPI(
   if (!g_gles2_interface) {
     g_gles2_interface = get_browser_interface(PPB_OPENGLES2_INTERFACE);
   }
+  if (!g_gles2_instanced_arrays_interface) {
+    g_gles2_instanced_arrays_interface =
+        get_browser_interface(PPB_OPENGLES2_INSTANCEDARRAYS_INTERFACE);
+  }
+  if (!g_gles2_framebuffer_blit_interface) {
+    g_gles2_framebuffer_blit_interface =
+        get_browser_interface(PPB_OPENGLES2_FRAMEBUFFERBLIT_INTERFACE);
+  }
+  if (!g_gles2_framebuffer_multisample_interface) {
+    g_gles2_framebuffer_multisample_interface =
+        get_browser_interface(PPB_OPENGLES2_FRAMEBUFFERMULTISAMPLE_INTERFACE);
+  }
+  if (!g_gles2_chromium_enable_feature_interface) {
+    g_gles2_chromium_enable_feature_interface =
+        get_browser_interface(PPB_OPENGLES2_CHROMIUMENABLEFEATURE_INTERFACE);
+  }
+  if (!g_gles2_chromium_map_sub_interface) {
+    g_gles2_chromium_map_sub_interface =
+        get_browser_interface(PPB_OPENGLES2_CHROMIUMMAPSUB_INTERFACE);
+  }
   return g_gles2_interface ? GL_TRUE : GL_FALSE;
 }
 
@@ -55,3 +85,27 @@ const struct PPB_OpenGLES2* GL_APIENTRY glGetInterfacePPAPI() {
   return g_gles2_interface;
 }
 
+const struct PPB_OpenGLES2InstancedArrays* GL_APIENTRY
+    glGetInstancedArraysInterfacePPAPI() {
+  return g_gles2_instanced_arrays_interface;
+}
+
+const struct PPB_OpenGLES2FramebufferBlit* GL_APIENTRY
+    glGetFramebufferBlitInterfacePPAPI() {
+  return g_gles2_framebuffer_blit_interface;
+}
+
+const struct PPB_OpenGLES2FramebufferMultisample* GL_APIENTRY
+    glGetFramebufferMultisampleInterfacePPAPI() {
+  return g_gles2_framebuffer_multisample_interface;
+}
+
+const struct PPB_OpenGLES2ChromiumEnableFeature* GL_APIENTRY
+    glGetChromiumEnableFeatureInterfacePPAPI() {
+  return g_gles2_chromium_enable_feature_interface;
+}
+
+const struct PPB_OpenGLES2ChromiumMapSub* GL_APIENTRY
+    glGetChromiumMapSubInterfacePPAPI() {
+  return g_gles2_chromium_map_sub_interface;
+}