Unit tests have been created for the GPUTiming.

ui/gl/gpu_timing_fake.cc

Index: ui/gl/gpu_timing_fake.cc
diff --git a/ui/gl/gpu_timing_fake.cc b/ui/gl/gpu_timing_fake.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ccc1ebe9cd5a202510269eea8cbe6a4c10ce87e2
--- /dev/null
+++ b/ui/gl/gpu_timing_fake.cc
@@ -0,0 +1,233 @@
+// Copyright 2015 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 "ui/gl/gpu_timing_fake.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gl/gl_mock.h"
+
+namespace gfx {
+
+using ::testing::_;
+using ::testing::AtLeast;
+using ::testing::AtMost;
+using ::testing::Exactly;
+using ::testing::Invoke;
+using ::testing::NotNull;
+
+GPUTimingFakeGLQueries::GPUTimingFakeGLQueries() {
+  Reset();
+}
+
+GPUTimingFakeGLQueries::~GPUTimingFakeGLQueries() {
+}
+
+void GPUTimingFakeGLQueries::Reset() {
+  current_time_ = 0;
+  next_query_id_ = 23;
+  allocated_queries_.clear();
+  query_results_.clear();
+  current_elapsed_query_.Reset();
+}
+
+void GPUTimingFakeGLQueries::SetCurrentGLTime(GLint64 current_time) {
+  current_time_ = current_time;
+}
+
+void GPUTimingFakeGLQueries::SetDisjoint() {
+  disjointed_ = true;
+}
+
+void GPUTimingFakeGLQueries::ExpectGetErrorCalls(MockGLInterface& gl) {
+  EXPECT_CALL(gl, GetError()).Times(AtLeast(0))
+      .WillRepeatedly(Invoke(this, &GPUTimingFakeGLQueries::FakeGLGetError));
+}
+
+void GPUTimingFakeGLQueries::ExpectDisjointCalls(MockGLInterface& gl) {
+  EXPECT_CALL(gl, GetIntegerv(GL_GPU_DISJOINT_EXT, _)).Times(AtLeast(1))
+      .WillRepeatedly(Invoke(this, &GPUTimingFakeGLQueries::FakeGLGetIntegerv));
+}
+
+void GPUTimingFakeGLQueries::ExpectNoDisjointCalls(MockGLInterface& gl) {
+  EXPECT_CALL(gl, GetIntegerv(GL_GPU_DISJOINT_EXT, _)).Times(Exactly(0));
+}
+
+void GPUTimingFakeGLQueries::ExpectGPUTimerQuery(
+    MockGLInterface& gl, bool elapsed_query) {
+  if (elapsed_query) {
+    // Currently do not support elapsed queries.
+    return;
+  }
+
+  EXPECT_CALL(gl, GenQueries(2, NotNull())).Times(AtLeast(1))
+      .WillRepeatedly(Invoke(this, &GPUTimingFakeGLQueries::FakeGLGenQueries));
+
+  if (elapsed_query) {
+    // Time Elapsed based queries.
+    EXPECT_CALL(gl, BeginQuery(GL_TIME_ELAPSED, _))
+        .WillRepeatedly(
+            Invoke(this, &GPUTimingFakeGLQueries::FakeGLBeginQuery));
+
+    EXPECT_CALL(gl, EndQuery(GL_TIME_ELAPSED))
+        .WillRepeatedly(Invoke(this, &GPUTimingFakeGLQueries::FakeGLEndQuery));
+  } else {
+    // Time Stamp based queries.
+    EXPECT_CALL(gl, GetInteger64v(GL_TIMESTAMP, _))
+        .WillRepeatedly(
+            Invoke(this, &GPUTimingFakeGLQueries::FakeGLGetInteger64v));
+
+    EXPECT_CALL(gl, QueryCounter(_, GL_TIMESTAMP)).Times(AtLeast(2))
+        .WillRepeatedly(
+             Invoke(this, &GPUTimingFakeGLQueries::FakeGLQueryCounter));
+  }
+
+  EXPECT_CALL(gl, GetQueryObjectiv(_, GL_QUERY_RESULT_AVAILABLE,
+                                        NotNull()))
+      .WillRepeatedly(
+          Invoke(this, &GPUTimingFakeGLQueries::FakeGLGetQueryObjectiv));
+
+  EXPECT_CALL(gl, GetQueryObjectui64v(_, GL_QUERY_RESULT, NotNull()))
+      .WillRepeatedly(
+           Invoke(this, &GPUTimingFakeGLQueries::FakeGLGetQueryObjectui64v));
+
+  EXPECT_CALL(gl, DeleteQueries(2, NotNull())).Times(AtLeast(1))
+      .WillRepeatedly(
+           Invoke(this, &GPUTimingFakeGLQueries::FakeGLDeleteQueries));
+}
+
+void GPUTimingFakeGLQueries::ExpectOffsetCalculationQuery(
+    MockGLInterface& gl) {
+  EXPECT_CALL(gl, GetInteger64v(GL_TIMESTAMP, NotNull()))
+      .Times(AtMost(1))
+      .WillRepeatedly(
+          Invoke(this, &GPUTimingFakeGLQueries::FakeGLGetInteger64v));
+}
+
+void GPUTimingFakeGLQueries::ExpectNoOffsetCalculationQuery(
+    MockGLInterface& gl) {
+  EXPECT_CALL(gl, GetInteger64v(GL_TIMESTAMP, NotNull())).Times(Exactly(0));
+}
+
+void GPUTimingFakeGLQueries::FakeGLGenQueries(GLsizei n, GLuint* ids) {
+  for (GLsizei i = 0; i < n; i++) {
+    ids[i] = next_query_id_++;
+    allocated_queries_.insert(ids[i]);
+  }
+}
+
+void GPUTimingFakeGLQueries::FakeGLDeleteQueries(GLsizei n, const GLuint* ids) {
+  for (GLsizei i = 0; i < n; i++) {
+    allocated_queries_.erase(ids[i]);
+    query_results_.erase(ids[i]);
+    if (current_elapsed_query_.query_id_ == ids[i])
+      current_elapsed_query_.Reset();
+  }
+}
+
+void GPUTimingFakeGLQueries::FakeGLBeginQuery(GLenum target, GLuint id) {
+  switch(target) {
+    case GL_TIME_ELAPSED:
+      ASSERT_FALSE(current_elapsed_query_.active_);
+      current_elapsed_query_.Reset();
+      current_elapsed_query_.active_ = true;
+      current_elapsed_query_.query_id_ = id;
+      current_elapsed_query_.begin_time_ = current_time_;
+      break;
+    default:
+      FAIL() << "Invalid target passed to BeginQuery: " << target;
+  }
+}
+
+void GPUTimingFakeGLQueries::FakeGLEndQuery(GLenum target) {
+  switch(target) {
+    case GL_TIME_ELAPSED: {
+      ASSERT_TRUE(current_elapsed_query_.active_);
+      QueryResult& query = query_results_[current_elapsed_query_.query_id_];
+      query.type_ = QueryResult::kQueryResultType_Elapsed;
+      query.begin_time_ = current_elapsed_query_.begin_time_;
+      query.value_ = current_time_;
+      current_elapsed_query_.active_ = false;
+    } break;
+    default:
+      FAIL() << "Invalid target passed to BeginQuery: " << target;
+  }
+}
+
+void GPUTimingFakeGLQueries::FakeGLGetQueryObjectiv(GLuint id, GLenum pname,
+                                                    GLint* params) {
+  switch (pname) {
+    case GL_QUERY_RESULT_AVAILABLE: {
+      std::map<GLuint, QueryResult>::iterator it = query_results_.find(id);
+      if (it != query_results_.end() && it->second.value_ <= current_time_)
+        *params = 1;
+      else
+        *params = 0;
+    } break;
+    default:
+      FAIL() << "Invalid variable passed to GetQueryObjectiv: " << pname;
+  }
+}
+
+void GPUTimingFakeGLQueries::FakeGLQueryCounter(GLuint id, GLenum target) {
+  switch (target) {
+    case GL_TIMESTAMP: {
+      ASSERT_TRUE(allocated_queries_.find(id) != allocated_queries_.end());
+      QueryResult& query = query_results_[id];
+      query.type_ = QueryResult::kQueryResultType_TimeStamp;
+      query.value_ = current_time_;
+    } break;
+
+    default:
+      FAIL() << "Invalid variable passed to QueryCounter: " << target;
+  }
+}
+
+void GPUTimingFakeGLQueries::FakeGLGetInteger64v(GLenum pname, GLint64 * data) {
+  switch (pname) {
+    case GL_TIMESTAMP:
+      *data = current_time_;
+      break;
+    default:
+      FAIL() << "Invalid variable passed to GetInteger64v: " << pname;
+  }
+}
+
+void GPUTimingFakeGLQueries::FakeGLGetQueryObjectui64v(GLuint id, GLenum pname,
+                                                       GLuint64* params) {
+  switch (pname) {
+    case GL_QUERY_RESULT: {
+      std::map<GLuint, QueryResult>::iterator it = query_results_.find(id);
+      ASSERT_TRUE(it != query_results_.end());
+      switch (it->second.type_) {
+        case QueryResult::kQueryResultType_TimeStamp:
+          *params = it->second.value_;
+          break;
+        case QueryResult::kQueryResultType_Elapsed:
+          *params = it->second.value_ - it->second.begin_time_;
+          break;
+        default:
+          FAIL() << "Invalid Query Result Type: " << it->second.type_;
+      }
+    } break;
+    default:
+      FAIL() << "Invalid variable passed to GetQueryObjectui64v: " << pname;
+  }
+}
+
+void GPUTimingFakeGLQueries::FakeGLGetIntegerv(GLenum pname, GLint* params) {
+  switch (pname) {
+    case GL_GPU_DISJOINT_EXT:
+      *params = static_cast<GLint>(disjointed_);
+      disjointed_ = false;
+      break;
+    default:
+      FAIL() << "Invalid variable passed to GetIntegerv: " << pname;
+  }
+}
+
+GLenum GPUTimingFakeGLQueries::FakeGLGetError() {
+  return GL_NO_ERROR;
+}
+
+}  // namespace gfx