Adds support for the GL_ANGLE_texture_usage and GL_EXT_texture_storage

gpu/command_buffer/service/texture_manager.cc

Index: gpu/command_buffer/service/texture_manager.cc
===================================================================
--- gpu/command_buffer/service/texture_manager.cc	(revision 112643)
+++ gpu/command_buffer/service/texture_manager.cc	(working copy)
@@ -368,6 +368,12 @@
     case GL_TEXTURE_MAX_ANISOTROPY_EXT:
       // Nothing to do for this case at the moment.
       break;
+    case GL_TEXTURE_USAGE_ANGLE:
+      if (!feature_info->validators()->texture_usage.IsValid(param)) {
+        return false;
+      }
+      usage_ = param;
+      break;
     default:
       NOTREACHED();
       return false;