gpu: introduce DISABLE_TEXTURE_STORAGE workaround for mesa

gpu/command_buffer/tests/gl_texture_storage_unittest.cc

 // Copyright 2014 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 <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 33 matching lines @@
   GLuint fbo_;
   bool extension_available_;
 };
 
 TEST_F(TextureStorageTest, CorrectPixels) {
   if (!extension_available_)
     return;
 
   glTexStorage2DEXT(GL_TEXTURE_2D, 2, GL_RGBA8_OES, 2, 2);
 
+  // Mesa dirvers crash without rebinding to FBO. It's why
+  // DISABLE_TEXTURE_STORAGE workaround is introduced. crbug.com/521904
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                         tex_, 0);
+
   uint8 source_pixels[16] = {
       1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4
   };
   glTexSubImage2D(GL_TEXTURE_2D,
                   0,
                   0, 0,
                   2, 2,
                   GL_RGBA, GL_UNSIGNED_BYTE,
                   source_pixels);
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, 2, 2, 0, source_pixels));
@@ skipping 85 matching lines @@
                GL_RGBA,
                GL_UNSIGNED_BYTE,
                NULL);
   EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());
 }
 
 }  // namespace gpu