Android: add UMA instrumentation for inertial sensors.

Device Motion/Orientation API use various sensors to determine
orientation, acceleration etc of the mobile device. Some of the
sensors may be or may not be available on the device. This
patch adds instrumentation for measuring sensor availability
across android based mobile devices.

BUG=

Review URL: https://codereview.chromium.org/66843010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239769 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 25 insertions, 1 deletions

diff --git a/content/browser/device_orientation/data_fetcher_impl_android.cc b/content/browser/device_orientation/data_fetcher_impl_android.cc
index 230507e..c103029 100644
--- a/content/browser/device_orientation/data_fetcher_impl_android.cc
+++ b/content/browser/device_orientation/data_fetcher_impl_android.cc
@@ -8,11 +8,20 @@
 
 #include "base/android/jni_android.h"
 #include "base/memory/singleton.h"
+#include "base/metrics/histogram.h"
 #include "content/browser/device_orientation/inertial_sensor_consts.h"
 #include "jni/DeviceMotionAndOrientation_jni.h"
 
 using base::android::AttachCurrentThread;
 
+namespace {
+
+static void updateRotationVectorHistogram(bool value) {
+  UMA_HISTOGRAM_BOOLEAN("InertialSensor.RotationVectorAndroidAvailable", value);
+}
+
+}
+
 namespace content {
 
 DataFetcherImplAndroid::DataFetcherImplAndroid()
@@ -54,8 +63,10 @@ void DataFetcherImplAndroid::GotOrientation(
   device_orientation_buffer_->data.hasGamma = true;
   device_orientation_buffer_->seqlock.WriteEnd();
 
-  if (!is_orientation_buffer_ready_)
+  if (!is_orientation_buffer_ready_) {
     SetOrientationBufferReadyStatus(true);
+    updateRotationVectorHistogram(true);
+  }
 }
 
 void DataFetcherImplAndroid::GotAcceleration(
@@ -191,6 +202,15 @@ void DataFetcherImplAndroid::CheckMotionBufferReadyToRead() {
     device_motion_buffer_->data.interval = kInertialSensorIntervalMillis;
     device_motion_buffer_->seqlock.WriteEnd();
     SetMotionBufferReadyStatus(true);
+
+    UMA_HISTOGRAM_BOOLEAN("InertialSensor.AccelerometerAndroidAvailable",
+        received_motion_data_[RECEIVED_MOTION_DATA_ACCELERATION] > 0);
+    UMA_HISTOGRAM_BOOLEAN(
+        "InertialSensor.AccelerometerIncGravityAndroidAvailable",
+        received_motion_data_[RECEIVED_MOTION_DATA_ACCELERATION_INCL_GRAVITY]
+        > 0);
+    UMA_HISTOGRAM_BOOLEAN("InertialSensor.GyroscopeAndroidAvailable",
+        received_motion_data_[RECEIVED_MOTION_DATA_ROTATION_RATE] > 0);
   }
 }
 
@@ -233,6 +253,10 @@ bool DataFetcherImplAndroid::StartFetchingDeviceOrientationData(
     // to start firing all-null events.
     SetOrientationBufferReadyStatus(!success);
   }
+
+  if (!success)
+    updateRotationVectorHistogram(false);
+
   return success;
 }