Changed the GPU Tracer so the category names can be customized.

gpu/command_buffer/service/gpu_tracer_unittest.cc

Index: gpu/command_buffer/service/gpu_tracer_unittest.cc
diff --git a/gpu/command_buffer/service/gpu_tracer_unittest.cc b/gpu/command_buffer/service/gpu_tracer_unittest.cc
index 2a7a94c174c8145cad10167891842f39cd755046..0d8245640a60d8bcf5b2d604856fbed8cc5562de 100644
--- a/gpu/command_buffer/service/gpu_tracer_unittest.cc
+++ b/gpu/command_buffer/service/gpu_tracer_unittest.cc
@@ -22,8 +22,9 @@ using ::testing::_;
 class MockOutputter : public Outputter {
  public:
   MockOutputter() {}
-  MOCK_METHOD3(Trace,
-               void(const std::string& name, int64 start_time, int64 end_time));
+  MOCK_METHOD4(Trace,
+               void(const std::string& category, const std::string& name,
+                    int64 start_time, int64 end_time));
 
  protected:
   ~MockOutputter() {}
@@ -113,6 +114,7 @@ class BaseGpuTracerTest : public GpuServiceTest {
     SetupTimerQueryMocks();
 
     // Expected results
+    const std::string category_name("trace_category");
     const std::string trace_name("trace_test");
     const int64 offset_time = 3231;
     const GLint64 start_timestamp = 7 * base::Time::kNanosecondsPerMicrosecond;
@@ -125,11 +127,12 @@ class BaseGpuTracerTest : public GpuServiceTest {
 
     // Expected Outputter::Trace call
     EXPECT_CALL(*outputter,
-                Trace(trace_name, expect_start_time, expect_end_time));
+                Trace(category_name, trace_name,
+                      expect_start_time, expect_end_time));
 
     scoped_refptr<GPUTrace> trace =
-        new GPUTrace(outputter_ref, trace_name, offset_time,
-                     GetTracerType());
+        new GPUTrace(outputter_ref, category_name, trace_name,
+                     offset_time, GetTracerType());
 
     gl_fake_queries_.SetCurrentGLTime(start_timestamp);
     trace->Start();