[GPU] GLES2 lost context recovery

gpu/command_buffer/client/gles2_demo_cc.cc

 // Copyright (c) 2009 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 <GLES2/gl2.h>
 #include "gpu/command_buffer/client/gles2_demo_cc.h"
 
@@ skipping 106 matching lines @@
   glBufferData(GL_ARRAY_BUFFER,
                sizeof(vertices) + sizeof(texCoords),
                NULL,
                GL_STATIC_DRAW);
   glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
   glBufferSubData(GL_ARRAY_BUFFER, g_texCoordOffset,
                   sizeof(texCoords), texCoords);
   CheckGLError();
 }
 
-void Draw() {
-  // Note: the viewport is automatically set up to cover the entire Canvas.
-  // Clear the color buffer
-  glClear(GL_COLOR_BUFFER_BIT);
-  CheckGLError();
-  // Use the program object
-  glUseProgram(g_programObject);
-  CheckGLError();
-  // Load the vertex data
-  glBindBuffer(GL_ARRAY_BUFFER, g_vbo);
-  glEnableVertexAttribArray(0);
-  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
-  glEnableVertexAttribArray(1);
-  glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0,
-                        reinterpret_cast<const void*>(g_texCoordOffset));
-  CheckGLError();
-  // Bind the texture to texture unit 0
-  glBindTexture(GL_TEXTURE_2D, g_texture);
-  CheckGLError();
-  // Point the uniform sampler to texture unit 0
-  glUniform1i(g_textureLoc, 0);
-  CheckGLError();
-  glDrawArrays(GL_TRIANGLES, 0, 6);
-  CheckGLError();
-  glFlush();
-}
-
 GLuint CreateCheckerboardTexture() {
   static unsigned char pixels[] = {
     255, 255, 255,
     0,   0,   0,
     0,   0,   0,
     255, 255, 255,
   };
   GLuint texture;
   glGenTextures(1, &texture);
   glBindTexture(GL_TEXTURE_2D, texture);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 2, 2, 0, GL_RGB, GL_UNSIGNED_BYTE,
                pixels);
   return texture;
 }
 
-void Init() {
+}  // anonymous namespace.
+
+void GLFromCPPInit() {
   glClearColor(0.f, 0.f, .7f, 1.f);
   g_texture = CreateCheckerboardTexture();
   InitShaders();
 }
 
-}  // anonymous namespace.
+void GLFromCPPDraw() {
+  // Note: the viewport is automatically set up to cover the entire Canvas.
+  // Clear the color buffer
+  glClear(GL_COLOR_BUFFER_BIT);
+  CheckGLError();
+  // Use the program object
+  glUseProgram(g_programObject);
+  CheckGLError();
+  // Load the vertex data
+  glBindBuffer(GL_ARRAY_BUFFER, g_vbo);
+  glEnableVertexAttribArray(0);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
+  glEnableVertexAttribArray(1);
+  glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0,
+                        reinterpret_cast<const void*>(g_texCoordOffset));
+  CheckGLError();
+  // Bind the texture to texture unit 0
+  glBindTexture(GL_TEXTURE_2D, g_texture);
+  CheckGLError();
+  // Point the uniform sampler to texture unit 0
+  glUniform1i(g_textureLoc, 0);
+  CheckGLError();
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+  CheckGLError();
+  glFlush();
+}
 
-void GLFromCPPTestFunction() {
-  static bool initialized = false;
-  if (!initialized) {
-    initialized = true;
-    Init();
-  }
-  Draw();
-}