Improve context loss error handling

gpu/command_buffer/common/gles2_cmd_utils.cc

 // 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 is here so other GLES2 related files can have a common set of
 // includes where appropriate.
 
 #include <sstream>
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 
 namespace gpu {
 namespace gles2 {
 
 namespace gl_error_bit {
 enum GLErrorBit {
   kNoError = 0,
   kInvalidEnum = (1 << 0),
   kInvalidValue = (1 << 1),
   kInvalidOperation = (1 << 2),
   kOutOfMemory = (1 << 3),
-  kInvalidFrameBufferOperation = (1 << 4)
+  kInvalidFrameBufferOperation = (1 << 4),
+  kContextLost = (1 << 5)
 };
 }
 
 int GLES2Util::GLGetNumValuesReturned(int id) const {
   switch (id) {
     // -- glGetBooleanv, glGetFloatv, glGetIntergerv
     case GL_ACTIVE_TEXTURE:
       return 1;
     case GL_ALIASED_LINE_WIDTH_RANGE:
       return 2;
@@ skipping 520 matching lines @@
     case GL_INVALID_ENUM:
       return gl_error_bit::kInvalidEnum;
     case GL_INVALID_VALUE:
       return gl_error_bit::kInvalidValue;
     case GL_INVALID_OPERATION:
       return gl_error_bit::kInvalidOperation;
     case GL_OUT_OF_MEMORY:
       return gl_error_bit::kOutOfMemory;
     case GL_INVALID_FRAMEBUFFER_OPERATION:
       return gl_error_bit::kInvalidFrameBufferOperation;
+    case GL_CONTEXT_LOST_KHR:
+      return gl_error_bit::kContextLost;
     default:
       NOTREACHED();
       return gl_error_bit::kNoError;
   }
 }
 
 uint32 GLES2Util::GLErrorBitToGLError(uint32 error_bit) {
   switch (error_bit) {
     case gl_error_bit::kInvalidEnum:
       return GL_INVALID_ENUM;
     case gl_error_bit::kInvalidValue:
       return GL_INVALID_VALUE;
     case gl_error_bit::kInvalidOperation:
       return GL_INVALID_OPERATION;
     case gl_error_bit::kOutOfMemory:
       return GL_OUT_OF_MEMORY;
     case gl_error_bit::kInvalidFrameBufferOperation:
       return GL_INVALID_FRAMEBUFFER_OPERATION;
+    case gl_error_bit::kContextLost:
+      return GL_CONTEXT_LOST_KHR;
     default:
       NOTREACHED();
       return GL_NO_ERROR;
   }
 }
 
 uint32 GLES2Util::IndexToGLFaceTarget(int index) {
   static uint32 faces[] = {
     GL_TEXTURE_CUBE_MAP_POSITIVE_X,
     GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
@@ skipping 342 matching lines @@
   }
 
   return true;
 }
 
 #include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu