Use gflags in teartest.

client/deps/glbench/src/main.h

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BENCH_GL_MAIN_H_
 #define BENCH_GL_MAIN_H_
 
+#include <gflags/gflags.h>
 #include <sys/time.h>
 
 #ifdef USE_GLES
 #include <EGL/egl.h>
 #include <GLES/gl.h>
 #else
 #include <GL/gl.h>
 #include <GL/glx.h>
 
 #define LIST_PROC_FUNCTIONS(F) \
@@ skipping 27 matching lines @@
 
 inline uint64_t GetUTime() {
   struct timeval tv;
   gettimeofday(&tv, NULL);
   return static_cast<uint64_t>(tv.tv_usec) +
     1000000ULL*static_cast<uint64_t>(tv.tv_sec);
 }
 
 extern GLint g_width;
 extern GLint g_height;
-extern bool g_override_redirect;
+DECLARE_bool(override_redirect);
 
 bool Init();
 bool InitContext();
 void DestroyContext();
 void SwapBuffers();
 bool SwapInterval(int interval);
 
 // BenchFunc functions are assumed to execute an operation iter times.  See
 // Bench for a detailed explanation.
 typedef void (*BenchFunc)(int iter);
@@ skipping 11 matching lines @@
 // that:
 //   time it took to run x iterations = slope * x + bias
 // Returns false if one iteration of the test takes longer than
 // MAX_ITERATION_LENGTH_MS.  The test is then assumed too slow to provide
 // meaningful results.
 bool Bench(BenchFunc func, float *slope, int64_t *bias);
 
 void *MmapFile(const char *name, size_t *length);
 
 #endif  // BENCH_GL_MAIN_H_