Implement safebrowsing download feedback service, enabled for dev & canary only.

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 9ca16183f1181667e87f82eac7fd4d815435e95f..7c7163228a3c38f2e4fc6f66e04200ca1c9e1921 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -839,6 +839,13 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="clickjacking.report_and_discard_download" units="ms">
+  <summary>
+    Time between &quot;Report and Discard&quot; button being shown and it being
+    clicked.
+  </summary>
+</histogram>
+
 <histogram name="Clipboard.IncognitoUseCase" enum="ClipboardAction">
   <obsolete>
     Deprecated as of 4/2013, experiment confirmed correctness of our patch.
@@ -9947,6 +9954,53 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="SBDownloadFeedback.Activations" enum="DownloadItem.DangerType">
+  <summary>
+    Count of times download feedback has been started, broken down by danger
+    type.
+  </summary>
+</histogram>
+
+<histogram name="SBDownloadFeedback.ActiveFeedbacks">
+  <summary>
+    When a new download feedback request is added, records the number of
+    download requests currently active and/or pending.
+  </summary>
+</histogram>
+
+<histogram name="SBDownloadFeedback.Shown" enum="DownloadItem.DangerType">
+  <summary>
+    Count of times download feedback button has been shown, broken down by
+    danger type.
+  </summary>
+</histogram>
+
+<histogram name="SBDownloadFeedback.SizeEligibleKB" units="KB">
+  <summary>
+    Size of downloads that were of the correct danger type, regardless if they
+    meet the max file size check or if they are actually uploaded or not.
+  </summary>
+</histogram>
+
+<histogram name="SBDownloadFeedback.SizeFailure" units="bytes">
+  <summary>
+    Size of downloads that failed to be uploaded to the feedback service.
+  </summary>
+</histogram>
+
+<histogram name="SBDownloadFeedback.SizeSuccess" units="bytes">
+  <summary>
+    Size of downloads that were successfully uploaded to the feedback service.
+  </summary>
+</histogram>
+
+<histogram name="SBDownloadFeedback.UploadResult"
+    enum="SBDownloadFeedbackUploadResult">
+  <summary>
+    Final result of attempt to upload binary to download feedback service.
+  </summary>
+</histogram>
+
 <histogram name="Search.DefaultSearchProvider" enum="OmniboxSearchEngine">
   <summary>
     The id of the default search engine that is loaded after Chrome startup. See
@@ -11894,6 +11948,17 @@ other types of suffix sets.
   <int value="2" label="GET_NON_CACHABLE"/>
 </enum>
 
+<enum name="DownloadItem.DangerType" type="int">
+  <int value="0" label="NOT_DANGEROUS"/>
+  <int value="1" label="DANGEROUS_FILE"/>
+  <int value="2" label="DANGEROUS_URL"/>
+  <int value="3" label="DANGEROUS_CONTENT"/>
+  <int value="4" label="MAYBE_DANGEROUS_CONTENT"/>
+  <int value="5" label="UNCOMMON_CONTENT"/>
+  <int value="6" label="USER_VALIDATED"/>
+  <int value="7" label="DANGEROUS_HOST"/>
+</enum>
+
 <enum name="DriveCacheDBOpenStatus" type="int">
   <int value="0" label="Success"/>
   <int value="1" label="Corrupt database"/>
@@ -15862,6 +15927,17 @@ other types of suffix sets.
   <int value="5" label="MODEL_MISSING_FIELDS"/>
 </enum>
 
+<enum name="SBDownloadFeedbackUploadResult" type="int">
+  <int value="0" label="SUCCESS"/>
+  <int value="1" label="UPLOAD_SUCCESS"/>
+  <int value="2" label="UPLOAD_CANCELLED"/>
+  <int value="3" label="UPLOAD_METADATA_NET_ERROR"/>
+  <int value="4" label="UPLOAD_METADATA_RESPONSE_ERROR"/>
+  <int value="5" label="UPLOAD_FILE_NET_ERROR"/>
+  <int value="6" label="UPLOAD_FILE_RESPONSE_ERROR"/>
+  <int value="7" label="UPLOAD_COMPLETE_RESPONSE_ERROR"/>
+</enum>
+
 <enum name="ShillTerminationActionResult" type="int">
   <summary>
     The termination action result types come from TerminationActionResult in