Query the GL limits for the passthrough command buffer.

gpu/command_buffer/service/gl_utils.h

 // 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.
 
 // This file includes all the necessary GL headers and implements some useful
 // utilities.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 
 #include <vector>
 
 #include "build/build_config.h"
 #include "ui/gl/gl_bindings.h"
 
 // Define this for extra GL error debugging (slower).
 // #define GL_ERROR_DEBUGGING
 #ifdef GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() do {                                           \
     GLenum gl_error = glGetError();                                     \
     LOG_IF(ERROR, gl_error != GL_NO_ERROR) << "GL Error :" << gl_error; \
   } while (0)
 #else  // GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() void(0)
 #endif  // GL_ERROR_DEBUGGING
 
+namespace gl {
+struct GLVersionInfo;
+}
+
 namespace gpu {
+
+struct Capabilities;
+class FeatureInfo;
+
 namespace gles2 {
 
 std::vector<int> GetAllGLErrors();
 
+bool PrecisionMeetsSpecForHighpFloat(GLint rangeMin,
+                                     GLint rangeMax,
+                                     GLint precision);
+void QueryShaderPrecisionFormat(const gl::GLVersionInfo& gl_version_info,
+                                GLenum shader_type,
+                                GLenum precision_type,
+                                GLint* range,
+                                GLint* precision);
+
+// Using the provided feature info, query the numeric limits of the underlying
+// GL and fill in the members of the Capabilities struct.  Does not perform any
+// extension checks.
+void PopulateNumericCapabilities(Capabilities* caps,
+                                 const FeatureInfo* feature_info);
+
 } // gles2
 } // gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_