Add UMA for WebBluetooth RSSI signal strength level

content/browser/bluetooth/bluetooth_device_chooser_controller.cc

 // Copyright 2016 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/bluetooth/bluetooth_device_chooser_controller.h"
 
 #include <set>
 #include <string>
 #include <unordered_set>
 
@@ skipping 17 matching lines @@
 
 namespace {
 
 // Anything worse than or equal to this will show 0 bars.
 const int kMinRSSI = -100;
 // Anything better than or equal to this will show the maximum bars.
 const int kMaxRSSI = -55;
 // Number of RSSI levels used in the signal strength image.
 const int kNumSignalStrengthLevels = 5;
 
+const content::UMARSSISignalStrengthLevel kRSSISignalStrengthEnumTable[] = {
+    content::UMARSSISignalStrengthLevel::LEVEL_0,
+    content::UMARSSISignalStrengthLevel::LEVEL_1,
+    content::UMARSSISignalStrengthLevel::LEVEL_2,
+    content::UMARSSISignalStrengthLevel::LEVEL_3,
+    content::UMARSSISignalStrengthLevel::LEVEL_4};
+
 }  // namespace
 
 namespace content {
 
 bool BluetoothDeviceChooserController::use_test_scan_duration_ = false;
 
 namespace {
 constexpr size_t kMaxLengthForDeviceName =
     29;  // max length of device name in filter.
 
@@ skipping 329 matching lines @@
     }
   }
 
   if (!powered) {
     discovery_session_timer_.Stop();
   }
 }
 
 int BluetoothDeviceChooserController::CalculateSignalStrengthLevel(
     int8_t rssi) {
-  if (rssi <= kMinRSSI)
+  RecordRSSISignalStrength(rssi);
+
+  if (rssi <= kMinRSSI) {
+    RecordRSSISignalStrengthLevel(
+        UMARSSISignalStrengthLevel::LESS_THAN_OR_EQUAL_TO_MIN_RSSI);
     return 0;
+  }
 
-  if (rssi >= kMaxRSSI)
+  if (rssi >= kMaxRSSI) {
+    RecordRSSISignalStrengthLevel(
+        UMARSSISignalStrengthLevel::GREATER_THAN_OR_EQUAL_TO_MAX_RSSI);
     return kNumSignalStrengthLevels - 1;
+  }
 
   double input_range = kMaxRSSI - kMinRSSI;
   double output_range = kNumSignalStrengthLevels - 1;
-  return static_cast<int>((rssi - kMinRSSI) * output_range / input_range);
+  int level = static_cast<int>((rssi - kMinRSSI) * output_range / input_range);
+  DCHECK(kNumSignalStrengthLevels == arraysize(kRSSISignalStrengthEnumTable));
+  RecordRSSISignalStrengthLevel(kRSSISignalStrengthEnumTable[level]);
+  return level;
 }
 
 void BluetoothDeviceChooserController::SetTestScanDurationForTesting() {
   BluetoothDeviceChooserController::use_test_scan_duration_ = true;
 }
 
 void BluetoothDeviceChooserController::PopulateConnectedDevices() {
   for (const device::BluetoothDevice* device : adapter_->GetDevices()) {
     if (device->IsGattConnected()) {
       AddFilteredDevice(*device);
@@ skipping 106 matching lines @@
 
 void BluetoothDeviceChooserController::PostErrorCallback(
     blink::mojom::WebBluetoothResult error) {
   if (!base::ThreadTaskRunnerHandle::Get()->PostTask(
           FROM_HERE, base::Bind(error_callback_, error))) {
     LOG(WARNING) << "No TaskRunner.";
   }
 }
 
 }  // namespace content