gpu: Thread-safe command buffer state lookup.

gpu/command_buffer/tests/gl_readback_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 <GLES2/gl2extchromium.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 12 matching lines @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gpu {
 
 class GLReadbackTest : public testing::Test {
  protected:
   void SetUp() override { gl_.Initialize(GLManager::Options()); }
 
   void TearDown() override { gl_.Destroy(); }
 
-  static void WaitForQueryCallback(int q, base::Closure cb) {
+  void WaitForQueryCallback(int q, base::Closure cb) {
     unsigned int done = 0;
+    gl_.PerformIdleWork();
     glGetQueryObjectuivEXT(q, GL_QUERY_RESULT_AVAILABLE_EXT, &done);
     if (done) {
       cb.Run();
     } else {
       base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
-          FROM_HERE, base::Bind(&WaitForQueryCallback, q, cb),
+          FROM_HERE, base::Bind(&GLReadbackTest::WaitForQueryCallback,
+                                base::Unretained(this), q, cb),
           base::TimeDelta::FromMilliseconds(3));
     }
   }
 
   void WaitForQuery(int q) {
     base::RunLoop run_loop;
     WaitForQueryCallback(q, run_loop.QuitClosure());
     run_loop.Run();
   }
 
   GLManager gl_;
 };
 
-
 TEST_F(GLReadbackTest, ReadPixelsWithPBOAndQuery) {
   const GLint kBytesPerPixel = 4;
   const GLint kWidth = 2;
   const GLint kHeight = 2;
 
   GLuint b, q;
   glClearColor(0.0, 0.0, 1.0, 1.0);
   glClear(GL_COLOR_BUFFER_BIT);
   glGenBuffers(1, &b);
   glGenQueriesEXT(1, &q);
@@ skipping 257 matching lines @@
 
     glDeleteFramebuffers(1, &framebuffer);
     glDeleteTextures(1, &texture_id);
   }
 
   glDeleteBuffers(1, &vertex_buffer);
   glDeleteProgram(program);
 }
 
 }  // namespace gpu