Photo Picker dialog: Add UMA statistics.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 81ea29002ff6ed11368beaf02cfa13a30a2eb440..9c2c5c52993a6b1ef26e8e04c0c4a70b3d8b7390 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -871,6 +871,49 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Android.PhotoPicker.BitmapScalerTask" units="ms">
+  <owner>finnur@chromium.org</owner>
+  <owner>twellington@chromium.org</owner>
+  <summary>
+    Measures the amount of time the BitmapScaler spends scaling per bitmap.
+  </summary>
+</histogram>
+
+<histogram name="Android.PhotoPicker.DialogAction"
+    enum="PhotoPickerDialogAction">
+  <owner>finnur@chromium.org</owner>
+  <owner>twellington@chromium.org</owner>
+  <summary>
+    Records which action the user takes in the PhotoPickerDialog.
+  </summary>
+</histogram>
+
+<histogram name="Android.PhotoPicker.ImageDecodeTime" units="ms">
+  <owner>finnur@chromium.org</owner>
+  <owner>twellington@chromium.org</owner>
+  <summary>
+    Measures the amount of time it takes the decoder to decode one image.
+  </summary>
+</histogram>
+
+<histogram name="Android.PhotoPicker.RequestProcessTime" units="ms">
+  <owner>finnur@chromium.org</owner>
+  <owner>twellington@chromium.org</owner>
+  <summary>
+    Measures the amount of time it takes to process one decode request end to
+    end (RPC and actual decoding of the bits by utility process).
+  </summary>
+</histogram>
+
+<histogram name="Android.PhotoPicker.UpscaleLowResBitmap" units="ms">
+  <owner>finnur@chromium.org</owner>
+  <owner>twellington@chromium.org</owner>
+  <summary>
+    Measures the amount of time it takes to upscale a bitmap from the low-res
+    cache.
+  </summary>
+</histogram>
+
 <histogram name="Android.PrepareMenu.OpenWebApkVisibilityCheck" units="ms">
   <owner>hanxi@chromium.org</owner>
   <owner>pkotwicz@chromium.org</owner>