Move DefaultAppName metrics from 0 to 10.

This CL is based on the review comments from crrev.com/c/1816495. To
unify the enum on AppService, we prefer update the enum start from 0 to
10.

BUG=1005640

Change-Id: Ifb70a24b1a3c1c4ac0693206c6df23cb190d067d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837551Reviewed-by: Nigel Tao <nigeltao@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704001}

chrome/browser/apps/app_service/app_service_metrics.h

@@ -15,14 +15,14 @@ namespace apps {
 // The app's histogram name. This is used for logging so do not change the
 // order of this enum.
 enum class DefaultAppName {
-  kCalculator = 0,
-  kText = 1,
-  kGetHelp = 2,
-  kGallery = 3,
-  kVideoPlayer = 4,
-  kAudioPlayer = 5,
-  kChromeCanvas = 6,
-  kCamera = 7,
+  kCalculator = 10,
+  kText = 11,
+  kGetHelp = 12,
+  kGallery = 13,
+  kVideoPlayer = 14,
+  kAudioPlayer = 15,
+  kChromeCanvas = 16,
+  kCamera = 17,
   // Add any new values above this one, and update kMaxValue to the highest
   // enumerator value.
   kMaxValue = kCamera,

tools/metrics/histograms/enums.xml

@@ -13223,14 +13223,14 @@ Called by update_net_error_codes.py.-->
 </enum>
 
 <enum name="DefaultAppName">
-  <int value="0" label="Calculator"/>
-  <int value="1" label="Text"/>
-  <int value="2" label="Get Help"/>
-  <int value="3" label="Gallery"/>
-  <int value="4" label="Video Player"/>
-  <int value="5" label="Audio Player"/>
-  <int value="6" label="Chrome Canvas"/>
-  <int value="7" label="Camera"/>
+  <int value="10" label="Calculator"/>
+  <int value="11" label="Text"/>
+  <int value="12" label="Get Help"/>
+  <int value="13" label="Gallery"/>
+  <int value="14" label="Video Player"/>
+  <int value="15" label="Audio Player"/>
+  <int value="16" label="Chrome Canvas"/>
+  <int value="17" label="Camera"/>
 </enum>
 
 <enum name="DefaultBrowserAsyncAttemptResult">