Add Pepper support for several GL extensions

ppapi/lib/gl/gles2/gl2ext_ppapi.c

 // Copyright (c) 2011 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/lib/gl/gles2/gl2ext_ppapi.h"
 
 #include <stddef.h>
 
 #ifndef GL_FALSE
 #define GL_FALSE 0
 #endif  // GL_FALSE
 
 #ifndef GL_TRUE
 #define GL_TRUE 1
 #endif  // GL_TRUE
 
 #if defined(__GNUC__) && !defined(__APPLE__)
 #define PP_TLS __thread
 #elif defined(_MSC_VER)
 #define PP_TLS __declspec(thread)
 #else
 // TODO(alokp): Fix all other platforms.
 #define PP_TLS
 #endif
 
 // 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_Dev*
+    g_gles2_instanced_arrays_interface = NULL;
+static const struct PPB_OpenGLES2FramebufferBlit_Dev*
+    g_gles2_framebuffer_blit_interface = NULL;
+static const struct PPB_OpenGLES2FramebufferMultisample_Dev*
+    g_gles2_framebuffer_multisample_interface = NULL;
+static const struct PPB_OpenGLES2ChromiumEnableFeature_Dev*
+    g_gles2_chromium_enable_feature_interface = NULL;
+static const struct PPB_OpenGLES2ChromiumMapSub_Dev*
+    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;
 
 GLboolean GL_APIENTRY glInitializePPAPI(
     PPB_GetInterface get_browser_interface) {
   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_DEV_INTERFACE);
+  }
+  if (!g_gles2_framebuffer_blit_interface) {
+    g_gles2_framebuffer_blit_interface =
+        get_browser_interface(PPB_OPENGLES2_FRAMEBUFFERBLIT_DEV_INTERFACE);
+  }
+  if (!g_gles2_framebuffer_multisample_interface) {
+    g_gles2_framebuffer_multisample_interface =
+        get_browser_interface(
+            PPB_OPENGLES2_FRAMEBUFFERMULTISAMPLE_DEV_INTERFACE);
+  }
+  if (!g_gles2_chromium_enable_feature_interface) {
+    g_gles2_chromium_enable_feature_interface =
+        get_browser_interface(
+            PPB_OPENGLES2_CHROMIUMENABLEFEATURE_DEV_INTERFACE);
+  }
+  if (!g_gles2_chromium_map_sub_interface) {
+    g_gles2_chromium_map_sub_interface =
+        get_browser_interface(PPB_OPENGLES2_CHROMIUMMAPSUB_DEV_INTERFACE);
+  }
   return g_gles2_interface ? GL_TRUE : GL_FALSE;
 }
 
 GLboolean GL_APIENTRY glTerminatePPAPI() {
   g_gles2_interface = NULL;
   return GL_TRUE;
 }
 
 void GL_APIENTRY glSetCurrentContextPPAPI(PP_Resource context) {
   g_current_context = context;
 }
 
 PP_Resource GL_APIENTRY glGetCurrentContextPPAPI() {
   return g_current_context;
 }
 
 const struct PPB_OpenGLES2* GL_APIENTRY glGetInterfacePPAPI() {
   return g_gles2_interface;
 }
 
+const struct PPB_OpenGLES2InstancedArrays_Dev* GL_APIENTRY
+    glGetInstancedArraysInterfacePPAPI() {
+  return g_gles2_instanced_arrays_interface;
+}
+
+const struct PPB_OpenGLES2FramebufferBlit_Dev* GL_APIENTRY
+    glGetFramebufferBlitInterfacePPAPI() {
+  return g_gles2_framebuffer_blit_interface;
+}
+
+const struct PPB_OpenGLES2FramebufferMultisample_Dev* GL_APIENTRY
+    glGetFramebufferMultisampleInterfacePPAPI() {
+  return g_gles2_framebuffer_multisample_interface;
+}
+
+const struct PPB_OpenGLES2ChromiumEnableFeature_Dev* GL_APIENTRY
+    glGetChromiumEnableFeatureInterfacePPAPI() {
+  return g_gles2_chromium_enable_feature_interface;
+}
+
+const struct PPB_OpenGLES2ChromiumMapSub_Dev* GL_APIENTRY
+    glGetChromiumMapSubInterfacePPAPI() {
+  return g_gles2_chromium_map_sub_interface;
+}