Record device scale factor in the metrics log

chrome/browser/metrics/metrics_log_unittest.cc

Index: chrome/browser/metrics/metrics_log_unittest.cc
diff --git a/chrome/browser/metrics/metrics_log_unittest.cc b/chrome/browser/metrics/metrics_log_unittest.cc
index 8f970717deeb5d177e1b514a903183625f48094e..c5ab9dd95710e95a18759a6fc919f55656f173e5 100644
--- a/chrome/browser/metrics/metrics_log_unittest.cc
+++ b/chrome/browser/metrics/metrics_log_unittest.cc
@@ -36,6 +36,7 @@ const int kSessionId = 127;
 const int kScreenWidth = 1024;
 const int kScreenHeight = 768;
 const int kScreenCount = 3;
+const float kScreenScaleFactor = 1;
 const chrome_variations::SelectedGroupId kFieldTrialIds[] = {
   {37, 43},
   {13, 47},
@@ -88,6 +89,10 @@ class TestMetricsLog : public MetricsLog {
     return gfx::Size(kScreenWidth, kScreenHeight);
   }
 
+  virtual float GetScreenDeviceScaleFactor() const OVERRIDE {
+    return kScreenScaleFactor;
+  }
+
   virtual int GetScreenCount() const OVERRIDE {
     return kScreenCount;
   }