Add presubmit check and automatic update script for ExtensionPermission enum.

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 8495206979d1cbd71b35be5f1350ed0781f82227..b7e5a6ca85fe455c31126e22ba1bd1746c812c30 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -25726,6 +25726,8 @@ other types of suffix sets.
 </enum>
 
 <enum name="ExtensionPermission" type="int">
+<!-- Generated from ../../../extensions/common/permissions/permission_message.h -->
+
   <int value="0" label="UNKNOWN"/>
   <int value="1" label="NONE"/>
   <int value="2" label="BOOKMARKS"/>
@@ -25734,27 +25736,57 @@ other types of suffix sets.
   <int value="5" label="TABS"/>
   <int value="6" label="MANAGEMENT"/>
   <int value="7" label="DEBUGGER"/>
-  <int value="8" label="1_HOST"/>
-  <int value="9" label="2_HOSTS"/>
-  <int value="10" label="3_HOSTS"/>
-  <int value="11" label="4_OR_MORE_HOSTS"/>
-  <int value="12" label="ALL_HOSTS"/>
-  <int value="13" label="FULL_ACCESS"/>
-  <int value="14" label="CLIPBOARD"/>
-  <int value="15" label="TTS_ENGINE"/>
-  <int value="16" label="CONTENT_SETTINGS"/>
-  <int value="17" label="PRIVACY"/>
-  <int value="18" label="MANAGED_MODE"/>
-  <int value="19" label="INPUT"/>
-  <int value="20" label="AUDIO_CAPTURE"/>
-  <int value="21" label="VIDEO_CAPTURE"/>
-  <int value="22" label="DOWNLOADS"/>
-  <int value="23" label="FILE_SYSTEM_WRITE"/>
-  <int value="24" label="ALL_MEDIA_GALLERIES"/>
-  <int value="25" label="SERIAL"/>
-  <int value="26" label="SOCKET_ANY_HOST"/>
-  <int value="27" label="SOCKET_DOMAIN_HOSTS"/>
-  <int value="28" label="SOCKET_SPECIFIC_HOSTS"/>
+  <int value="8" label="DESKTOP_CAPTURE"/>
+  <int value="9" label="HID"/>
+  <int value="10" label="HOSTS1"/>
+  <int value="11" label="HOSTS2"/>
+  <int value="12" label="HOSTS3"/>
+  <int value="13" label="HOSTS4_OR_MORE"/>
+  <int value="14" label="HOSTS_ALL"/>
+  <int value="15" label="FULL_ACCESS"/>
+  <int value="16" label="CLIPBOARD"/>
+  <int value="17" label="TTS_ENGINE"/>
+  <int value="18" label="CONTENT_SETTINGS"/>
+  <int value="19" label="PRIVACY"/>
+  <int value="20" label="MANAGED_MODE"/>
+  <int value="21" label="INPUT"/>
+  <int value="22" label="AUDIO_CAPTURE"/>
+  <int value="23" label="VIDEO_CAPTURE"/>
+  <int value="24" label="DOWNLOADS"/>
+  <int value="25" label="FILE_SYSTEM_WRITE"/>
+  <int value="26" label="MEDIA_GALLERIES_ALL_GALLERIES_READ"/>
+  <int value="27" label="SERIAL"/>
+  <int value="28" label="SOCKET_ANY_HOST"/>
+  <int value="29" label="SOCKET_DOMAIN_HOSTS"/>
+  <int value="30" label="SOCKET_SPECIFIC_HOSTS"/>
+  <int value="31" label="BLUETOOTH"/>
+  <int value="32" label="USB"/>
+  <int value="33" label="SYSTEM_INDICATOR"/>
+  <int value="34" label="USB_DEVICE"/>
+  <int value="35" label="MEDIA_GALLERIES_ALL_GALLERIES_COPY_TO"/>
+  <int value="36" label="SYSTEM_INFO_DISPLAY"/>
+  <int value="37" label="NATIVE_MESSAGING"/>
+  <int value="38" label="SYNC_FILE_SYSTEM"/>
+  <int value="39" label="AUDIO"/>
+  <int value="40" label="FAVICON"/>
+  <int value="41" label="MUSIC_MANAGER_PRIVATE"/>
+  <int value="42" label="WEB_CONNECTABLE"/>
+  <int value="43" label="ACTIVITY_LOG_PRIVATE"/>
+  <int value="44" label="BLUETOOTH_DEVICES"/>
+  <int value="45" label="DOWNLOADS_OPEN"/>
+  <int value="46" label="NETWORKING_PRIVATE"/>
+  <int value="47" label="DECLARATIVE_WEB_REQUEST"/>
+  <int value="48" label="FILE_SYSTEM_DIRECTORY"/>
+  <int value="49" label="FILE_SYSTEM_WRITE_DIRECTORY"/>
+  <int value="50" label="SIGNED_IN_DEVICES"/>
+  <int value="51" label="WALLPAPER"/>
+  <int value="52" label="NETWORK_STATE"/>
+  <int value="53" label="HOMEPAGE"/>
+  <int value="54" label="SEARCH_PROVIDER"/>
+  <int value="55" label="STARTUP_PAGES"/>
+  <int value="56" label="MEDIA_GALLERIES_ALL_GALLERIES_DELETE"/>
+  <int value="57" label="SCREENLOCK_PRIVATE"/>
+  <int value="58" label="OVERRIDE_BOOKMARKS_U_I"/>

[ahernandez, 2014/02/18 19:50:46]

When converting from the 'kLabelName' style to the all caps unix name style, it
causes weird things like this 'OVERRIDE_BOOKMARKS_U_I' label to appear. Should
there be special cases accounted for? Or should the naming conventions in
permission_message.h be changed to make it easier for automatic updating?

[rpaquay, 2014/02/18 21:39:26]

I would argue for a special case, implementing along the lines of "if the enum
label is mixed case and contains "UI" uppercase, then don't split".

 </enum>
 
 <enum name="ExtensionServiceVerifyAllSuccess" type="int">