Revert of Gardening: Revert "Use AudioStreamMonitor to control power save blocking."

content/browser/media/audio_stream_monitor_unittest.cc

Index: content/browser/media/audio_stream_monitor_unittest.cc
diff --git a/content/browser/media/audio_stream_monitor_unittest.cc b/content/browser/media/audio_stream_monitor_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b8871af65636e896ebe4b84eba3787ca67961b6a
--- /dev/null
+++ b/content/browser/media/audio_stream_monitor_unittest.cc
@@ -0,0 +1,297 @@
+// 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 "content/browser/media/audio_stream_monitor.h"
+
+#include <map>
+#include <utility>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/test/simple_test_tick_clock.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/public/browser/invalidate_type.h"
+#include "content/public/browser/web_contents_delegate.h"
+#include "content/public/test/test_renderer_host.h"
+#include "media/audio/audio_power_monitor.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ::testing::InvokeWithoutArgs;
+
+namespace content {
+
+namespace {
+
+const int kRenderProcessId = 1;
+const int kAnotherRenderProcessId = 2;
+const int kStreamId = 3;
+const int kAnotherStreamId = 6;
+
+// Used to confirm audio indicator state changes occur at the correct times.
+class MockWebContentsDelegate : public WebContentsDelegate {
+ public:
+  MOCK_METHOD2(NavigationStateChanged,
+               void(const WebContents* source, InvalidateTypes changed_flags));
+};
+
+}  // namespace
+
+class AudioStreamMonitorTest : public RenderViewHostTestHarness {
+ public:
+  AudioStreamMonitorTest() {
+    // Start |clock_| at non-zero.
+    clock_.Advance(base::TimeDelta::FromSeconds(1000000));
+  }
+
+  virtual void SetUp() OVERRIDE {
+    RenderViewHostTestHarness::SetUp();
+
+    WebContentsImpl* web_contents = reinterpret_cast<WebContentsImpl*>(
+        RenderViewHostTestHarness::web_contents());
+    web_contents->SetDelegate(&mock_web_contents_delegate_);
+    monitor_ = web_contents->audio_stream_monitor();
+    const_cast<base::TickClock*&>(monitor_->clock_) = &clock_;
+  }
+
+  base::TimeTicks GetTestClockTime() { return clock_.NowTicks(); }
+
+  void AdvanceClock(const base::TimeDelta& delta) { clock_.Advance(delta); }
+
+  AudioStreamMonitor::ReadPowerAndClipCallback CreatePollCallback(
+      int stream_id) {
+    return base::Bind(
+        &AudioStreamMonitorTest::ReadPower, base::Unretained(this), stream_id);
+  }
+
+  void SetStreamPower(int stream_id, float power) {
+    current_power_[stream_id] = power;
+  }
+
+  void SimulatePollTimerFired() { monitor_->Poll(); }
+
+  void SimulateOffTimerFired() { monitor_->MaybeToggle(); }
+
+  void ExpectIsPolling(int render_process_id, int stream_id, bool is_polling) {
+    const AudioStreamMonitor::StreamID key(render_process_id, stream_id);
+    EXPECT_EQ(
+        is_polling,
+        monitor_->poll_callbacks_.find(key) != monitor_->poll_callbacks_.end());
+    EXPECT_EQ(!monitor_->poll_callbacks_.empty(),
+              monitor_->poll_timer_.IsRunning());
+  }
+
+  void ExpectTabWasRecentlyAudible(bool was_audible,
+                                   const base::TimeTicks& last_blurt_time) {
+    EXPECT_EQ(was_audible, monitor_->was_recently_audible_);
+    EXPECT_EQ(last_blurt_time, monitor_->last_blurt_time_);
+    EXPECT_EQ(monitor_->was_recently_audible_,
+              monitor_->off_timer_.IsRunning());
+  }
+
+  void ExpectWebContentsWillBeNotifiedOnce(bool should_be_audible) {
+    EXPECT_CALL(
+        mock_web_contents_delegate_,
+        NavigationStateChanged(RenderViewHostTestHarness::web_contents(),
+                               INVALIDATE_TYPE_TAB))
+        .WillOnce(InvokeWithoutArgs(
+            this,
+            should_be_audible
+                ? &AudioStreamMonitorTest::ExpectIsNotifyingForToggleOn
+                : &AudioStreamMonitorTest::ExpectIsNotifyingForToggleOff))
+        .RetiresOnSaturation();
+  }
+
+  static base::TimeDelta one_polling_interval() {
+    return base::TimeDelta::FromSeconds(1) /
+           AudioStreamMonitor::kPowerMeasurementsPerSecond;
+  }
+
+  static base::TimeDelta holding_period() {
+    return base::TimeDelta::FromMilliseconds(
+        AudioStreamMonitor::kHoldOnMilliseconds);
+  }
+
+  void StartMonitoring(
+      int render_process_id,
+      int stream_id,
+      const AudioStreamMonitor::ReadPowerAndClipCallback& callback) {
+    monitor_->StartMonitoringStreamOnUIThread(
+        render_process_id, stream_id, callback);
+  }
+
+  void StopMonitoring(int render_process_id, int stream_id) {
+    monitor_->StopMonitoringStreamOnUIThread(render_process_id, stream_id);
+  }
+
+ protected:
+  AudioStreamMonitor* monitor_;
+
+ private:
+  std::pair<float, bool> ReadPower(int stream_id) {
+    return std::make_pair(current_power_[stream_id], false);
+  }
+
+  void ExpectIsNotifyingForToggleOn() {
+    EXPECT_TRUE(monitor_->WasRecentlyAudible());
+  }
+
+  void ExpectIsNotifyingForToggleOff() {
+    EXPECT_FALSE(monitor_->WasRecentlyAudible());
+  }
+
+  MockWebContentsDelegate mock_web_contents_delegate_;
+  base::SimpleTestTickClock clock_;
+  std::map<int, float> current_power_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioStreamMonitorTest);
+};
+
+// Tests that AudioStreamMonitor is polling while it has a
+// ReadPowerAndClipCallback, and is not polling at other times.
+TEST_F(AudioStreamMonitorTest, PollsWhenProvidedACallback) {
+  EXPECT_FALSE(monitor_->WasRecentlyAudible());
+  ExpectIsPolling(kRenderProcessId, kStreamId, false);
+
+  StartMonitoring(kRenderProcessId, kStreamId, CreatePollCallback(kStreamId));
+  EXPECT_FALSE(monitor_->WasRecentlyAudible());
+  ExpectIsPolling(kRenderProcessId, kStreamId, true);
+
+  StopMonitoring(kRenderProcessId, kStreamId);
+  EXPECT_FALSE(monitor_->WasRecentlyAudible());
+  ExpectIsPolling(kRenderProcessId, kStreamId, false);
+}
+
+// Tests that AudioStreamMonitor debounces the power level readings it's taking,
+// which could be fluctuating rapidly between the audible versus silence
+// threshold.  See comments in audio_stream_monitor.h for expected behavior.
+TEST_F(AudioStreamMonitorTest,
+       ImpulsesKeepIndicatorOnUntilHoldingPeriodHasPassed) {
+  StartMonitoring(kRenderProcessId, kStreamId, CreatePollCallback(kStreamId));
+
+  // Expect WebContents will get one call form AudioStreamMonitor to toggle the
+  // indicator on upon the very first poll.
+  ExpectWebContentsWillBeNotifiedOnce(true);
+
+  // Loop, each time testing a slightly longer period of polled silence.  The
+  // indicator should remain on throughout.
+  int num_silence_polls = 0;
+  base::TimeTicks last_blurt_time;
+  do {
+    // Poll an audible signal, and expect tab indicator state is on.
+    SetStreamPower(kStreamId, media::AudioPowerMonitor::max_power());
+    last_blurt_time = GetTestClockTime();
+    SimulatePollTimerFired();
+    ExpectTabWasRecentlyAudible(true, last_blurt_time);
+    AdvanceClock(one_polling_interval());
+
+    // Poll a silent signal repeatedly, ensuring that the indicator is being
+    // held on during the holding period.
+    SetStreamPower(kStreamId, media::AudioPowerMonitor::zero_power());
+    for (int i = 0; i < num_silence_polls; ++i) {
+      SimulatePollTimerFired();
+      ExpectTabWasRecentlyAudible(true, last_blurt_time);
+      // Note: Redundant off timer firings should not have any effect.
+      SimulateOffTimerFired();
+      ExpectTabWasRecentlyAudible(true, last_blurt_time);
+      AdvanceClock(one_polling_interval());
+    }
+
+    ++num_silence_polls;
+  } while (GetTestClockTime() < last_blurt_time + holding_period());
+
+  // At this point, the clock has just advanced to beyond the holding period, so
+  // the next firing of the off timer should turn off the tab indicator.  Also,
+  // make sure it stays off for several cycles thereafter.
+  ExpectWebContentsWillBeNotifiedOnce(false);
+  for (int i = 0; i < 10; ++i) {
+    SimulateOffTimerFired();
+    ExpectTabWasRecentlyAudible(false, last_blurt_time);
+    AdvanceClock(one_polling_interval());
+  }
+}
+
+// Tests that the AudioStreamMonitor correctly processes the blurts from two
+// different streams in the same tab.
+TEST_F(AudioStreamMonitorTest, HandlesMultipleStreamsBlurting) {
+  StartMonitoring(kRenderProcessId, kStreamId, CreatePollCallback(kStreamId));
+  StartMonitoring(
+      kRenderProcessId, kAnotherStreamId, CreatePollCallback(kAnotherStreamId));
+
+  base::TimeTicks last_blurt_time;
+  ExpectTabWasRecentlyAudible(false, last_blurt_time);
+
+  // Measure audible sound from the first stream and silence from the second.
+  // The indicator turns on (i.e., tab was recently audible).
+  ExpectWebContentsWillBeNotifiedOnce(true);
+  SetStreamPower(kStreamId, media::AudioPowerMonitor::max_power());
+  SetStreamPower(kAnotherStreamId, media::AudioPowerMonitor::zero_power());
+  last_blurt_time = GetTestClockTime();
+  SimulatePollTimerFired();
+  ExpectTabWasRecentlyAudible(true, last_blurt_time);
+
+  // Halfway through the holding period, the second stream joins in.  The
+  // indicator stays on.
+  AdvanceClock(holding_period() / 2);
+  SimulateOffTimerFired();
+  SetStreamPower(kAnotherStreamId, media::AudioPowerMonitor::max_power());
+  last_blurt_time = GetTestClockTime();
+  SimulatePollTimerFired();  // Restarts holding period.
+  ExpectTabWasRecentlyAudible(true, last_blurt_time);
+
+  // Now, measure silence from both streams.  After an entire holding period
+  // has passed (since the second stream joined in), the indicator should turn
+  // off.
+  ExpectWebContentsWillBeNotifiedOnce(false);
+  AdvanceClock(holding_period());
+  SimulateOffTimerFired();
+  SetStreamPower(kStreamId, media::AudioPowerMonitor::zero_power());
+  SetStreamPower(kAnotherStreamId, media::AudioPowerMonitor::zero_power());
+  SimulatePollTimerFired();
+  ExpectTabWasRecentlyAudible(false, last_blurt_time);
+
+  // Now, measure silence from the first stream and audible sound from the
+  // second.  The indicator turns back on.
+  ExpectWebContentsWillBeNotifiedOnce(true);
+  SetStreamPower(kAnotherStreamId, media::AudioPowerMonitor::max_power());
+  last_blurt_time = GetTestClockTime();
+  SimulatePollTimerFired();
+  ExpectTabWasRecentlyAudible(true, last_blurt_time);
+
+  // From here onwards, both streams are silent.  Halfway through the holding
+  // period, the indicator should not have changed.
+  SetStreamPower(kAnotherStreamId, media::AudioPowerMonitor::zero_power());
+  AdvanceClock(holding_period() / 2);
+  SimulatePollTimerFired();
+  SimulateOffTimerFired();
+  ExpectTabWasRecentlyAudible(true, last_blurt_time);
+
+  // Just past the holding period, the indicator should be turned off.
+  ExpectWebContentsWillBeNotifiedOnce(false);
+  AdvanceClock(holding_period() - (GetTestClockTime() - last_blurt_time));
+  SimulateOffTimerFired();
+  ExpectTabWasRecentlyAudible(false, last_blurt_time);
+
+  // Polling should not turn the indicator back while both streams are remaining
+  // silent.
+  for (int i = 0; i < 100; ++i) {
+    AdvanceClock(one_polling_interval());
+    SimulatePollTimerFired();
+    ExpectTabWasRecentlyAudible(false, last_blurt_time);
+  }
+}
+
+TEST_F(AudioStreamMonitorTest, MultipleRendererProcesses) {
+  StartMonitoring(kRenderProcessId, kStreamId, CreatePollCallback(kStreamId));
+  StartMonitoring(
+      kAnotherRenderProcessId, kStreamId, CreatePollCallback(kStreamId));
+  ExpectIsPolling(kRenderProcessId, kStreamId, true);
+  ExpectIsPolling(kAnotherRenderProcessId, kStreamId, true);
+  StopMonitoring(kAnotherRenderProcessId, kStreamId);
+  ExpectIsPolling(kRenderProcessId, kStreamId, true);
+  ExpectIsPolling(kAnotherRenderProcessId, kStreamId, false);
+}
+
+}  // namespace content