Revert of Move BenchTimer to tools as Timer

bench/BenchTimer.h

Index: bench/BenchTimer.h
diff --git a/bench/BenchTimer.h b/bench/BenchTimer.h
new file mode 100644
index 0000000000000000000000000000000000000000..2abf10b80f9e1d4cca7234cbbd2782af8a37c980
--- /dev/null
+++ b/bench/BenchTimer.h
@@ -0,0 +1,67 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkBenchTimer_DEFINED
+#define SkBenchTimer_DEFINED
+
+#include <SkTypes.h>
+
+
+class BenchSysTimer;
+class BenchGpuTimer;
+
+class SkGLContextHelper;
+
+/**
+ * SysTimers and GpuTimers are implemented orthogonally.
+ * This class combines 2 SysTimers and a GpuTimer into one single,
+ * platform specific Timer with a simple interface. The truncated
+ * timer doesn't include the time required for the GPU to finish
+ * its rendering. It should always be <= the un-truncated system
+ * times and (for GPU configurations) can be used to roughly (very
+ * roughly) gauge the GPU load/backlog.
+ */
+class BenchTimer {
+public:
+    BenchTimer(SkGLContextHelper* gl = NULL);
+    ~BenchTimer();
+    void start(double durationScale = 1);
+    void end();
+    void truncatedEnd();
+    double fCpu;
+    double fWall;
+    double fTruncatedCpu;
+    double fTruncatedWall;
+    double fGpu;
+
+private:
+    BenchSysTimer* fSysTimer;
+    BenchSysTimer* fTruncatedSysTimer;
+#if SK_SUPPORT_GPU
+    BenchGpuTimer* fGpuTimer;
+#endif
+    double fDurationScale;  // for this start/end session
+};
+
+// Same as BenchTimer above, supporting only fWall but with much lower overhead.
+// (Typically, ~30ns instead of BenchTimer's ~1us.)
+class WallTimer {
+public:
+    WallTimer();
+    ~WallTimer();
+
+    void start(double durationScale = 1);
+    void end();
+
+    double fWall;
+
+private:
+    BenchSysTimer* fSysTimer;
+    double fDurationScale;
+};
+
+#endif