Add OpenGL occlusion query support to pepper.

ppapi/lib/gl/gles2/gl2ext_ppapi.c

 // 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/lib/gl/gles2/gl2ext_ppapi.h"
 
 #include <stddef.h>
 
 #ifndef GL_FALSE
 #define GL_FALSE 0
@@ skipping 18 matching lines @@
 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;
+static const struct PPB_OpenGLES2Query_Dev*
+    g_gles2_query_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) {
@@ skipping 11 matching lines @@
   }
   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);
   }
+  if (!g_gles2_query_interface) {
+    g_gles2_query_interface =
+        get_browser_interface(PPB_OPENGLES2_QUERY_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;
@@ skipping 24 matching lines @@
 
 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;
 }
+
+const struct PPB_OpenGLES2Query_Dev* GL_APIENTRY
+    glGetQueryInterfacePPAPI() {
+  return g_gles2_query_interface;
+}