Collect UMA statistics on which chrome://flags lead to chrome restart on ChromeOS.

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 bba0069b55ea8d66ca9883825aac51903da77ba4..0aca35747faeb6004e05fc318ac9c60a0c808440 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -9518,6 +9518,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Login.CustomFlags" enum="LoginCustomFlags">
+  <owner>alemate@chromium.org</owner>
+  <summary>
+    A set of chrome flags that required browser restart on Chrome OS user sign
+    in.
+  </summary>
+</histogram>
+
 <histogram name="Login.FailureReason" enum="LoginFailureReason">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>Chrome OS login failure reason.</summary>
@@ -39272,6 +39280,504 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="1" label="ONLY_WHITELISTED_ALLOWED">Whitelisted users only</int>
 </enum>
 
+<enum name="LoginCustomFlags" type="int">
+  <summary>Chrome flags that lead to chrome restart on ChromeOS.</summary>
+  <int value="0" label="UNKNOWN_FLAG">Unknown flag.</int>
+  <int value="1" label="BAD_FLAG_FORMAT">Bad flag format.</int>
+  <int value="2" label="reserved2">ID 2 reserved for future use.</int>
+  <int value="3" label="reserved3">ID 3 reserved for future use.</int>
+  <int value="4" label="reserved4">ID 4 reserved for future use.</int>
+  <int value="5" label="overscroll-history-navigation">
+    overscroll-history-navigation
+  </int>
+  <int value="6" label="enable-service-worker-sync">
+    enable-service-worker-sync
+  </int>
+  <int value="7" label="no-pings">no-pings</int>
+  <int value="8" label="no-experiments">no-experiments</int>
+  <int value="9" label="enable-one-copy">enable-one-copy</int>
+  <int value="10" label="disable-gesture-tap-highlight">
+    disable-gesture-tap-highlight
+  </int>
+  <int value="11" label="file-manager-enable-new-gallery">
+    file-manager-enable-new-gallery
+  </int>
+  <int value="12" label="enable-quic-https">enable-quic-https</int>
+  <int value="13" label="enable-network-portal-notification">
+    enable-network-portal-notification
+  </int>
+  <int value="14" label="enable-fixed-position-compositing">
+    enable-fixed-position-compositing
+  </int>
+  <int value="15" label="enable-virtual-keyboard-overscroll">
+    enable-virtual-keyboard-overscroll
+  </int>
+  <int value="16" label="allow-insecure-websocket-from-https-origin">
+    allow-insecure-websocket-from-https-origin
+  </int>
+  <int value="17" label="enable-web-based-signin">enable-web-based-signin</int>
+  <int value="18" label="show-fps-counter">show-fps-counter</int>
+  <int value="19" label="enable-offline-auto-reload">
+    enable-offline-auto-reload
+  </int>
+  <int value="20" label="enable-filemanager-mtp">enable-filemanager-mtp</int>
+  <int value="21" label="enable-panels">enable-panels</int>
+  <int value="22" label="enable-scripts-require-action">
+    enable-scripts-require-action
+  </int>
+  <int value="23" label="enable-smooth-scrolling">enable-smooth-scrolling</int>
+  <int value="24" label="disable-delegated-renderer">
+    disable-delegated-renderer
+  </int>
+  <int value="25" label="disabled">disabled</int>
+  <int value="26" label="malware-interstitial-v2">malware-interstitial-v2</int>
+  <int value="27" label="disable-touch-editing">disable-touch-editing</int>
+  <int value="28" label="prefetch-search-results">prefetch-search-results</int>
+  <int value="29" label="disable-password-manager-reauthentication">
+    disable-password-manager-reauthentication
+  </int>
+  <int value="30" label="enable-search-button-in-omnibox-always">
+    enable-search-button-in-omnibox-always
+  </int>
+  <int value="31" label="disable-webaudio">disable-webaudio</int>
+  <int value="32" label="default-tile-height">default-tile-height</int>
+  <int value="33" label="enable-session-crashed-bubble">
+    enable-session-crashed-bubble
+  </int>
+  <int value="34" label="disable-quickoffice-component-app">
+    disable-quickoffice-component-app
+  </int>
+  <int value="35" label="debug-packed-apps">debug-packed-apps</int>
+  <int value="36" label="enable-suggestions-service">
+    enable-suggestions-service
+  </int>
+  <int value="37" label="tab-capture-downscale-quality">
+    tab-capture-downscale-quality
+  </int>
+  <int value="38" label="manual-enhanced-bookmarks-optout">
+    manual-enhanced-bookmarks-optout
+  </int>
+  <int value="39" label="disable-accelerated-fixed-root-background">
+    disable-accelerated-fixed-root-background
+  </int>
+  <int value="40" label="ash-touch-hud">ash-touch-hud</int>
+  <int value="41" label="disable-device-enumeration">
+    disable-device-enumeration
+  </int>
+  <int value="42" label="disable-pinch-virtual-viewport">
+    disable-pinch-virtual-viewport
+  </int>
+  <int value="43" label="enable-deferred-image-decoding">
+    enable-deferred-image-decoding
+  </int>
+  <int value="44" label="disable-input-view">disable-input-view</int>
+  <int value="45" label="disable-device-discovery-notifications">
+    disable-device-discovery-notifications
+  </int>
+  <int value="46" label="enable-password-generation">
+    enable-password-generation
+  </int>
+  <int value="47" label="manual-enhanced-bookmarks">
+    manual-enhanced-bookmarks
+  </int>
+  <int value="48" label="extension-content-verification">
+    extension-content-verification
+  </int>
+  <int value="49" label="enable-ephemeral-apps">enable-ephemeral-apps</int>
+  <int value="50" label="enable-quic">enable-quic</int>
+  <int value="51" label="enable-first-run-ui-transitions">
+    enable-first-run-ui-transitions
+  </int>
+  <int value="52" label="enable-search-button-in-omnibox-for-str">
+    enable-search-button-in-omnibox-for-str
+  </int>
+  <int value="53" label="enable-distance-field-text">
+    enable-distance-field-text
+  </int>
+  <int value="54" label="disable-text-input-focus-manager">
+    disable-text-input-focus-manager
+  </int>
+  <int value="55" label="touch-scrolling-mode">touch-scrolling-mode</int>
+  <int value="56" label="disable-overlay-scrollbar">
+    disable-overlay-scrollbar
+  </int>
+  <int value="57" label="max-tiles-for-interest-area">
+    max-tiles-for-interest-area
+  </int>
+  <int value="58" label="force-gpu-rasterization">force-gpu-rasterization</int>
+  <int value="59" label="allow-nacl-socket-api">allow-nacl-socket-api</int>
+  <int value="60" label="enable-request-tablet-site">
+    enable-request-tablet-site
+  </int>
+  <int value="61" label="enforce_strict">enforce_strict</int>
+  <int value="62" label="disable-software-rasterizer">
+    disable-software-rasterizer
+  </int>
+  <int value="63" label="enable-apps-file-associations">
+    enable-apps-file-associations
+  </int>
+  <int value="64" label="ssl-interstitial-v2-gray">
+    ssl-interstitial-v2-gray
+  </int>
+  <int value="65" label="show-autofill-type-predictions">
+    show-autofill-type-predictions
+  </int>
+  <int value="66" label="enable-viewport-meta">enable-viewport-meta</int>
+  <int value="67" label="silent-debugger-extension-api">
+    silent-debugger-extension-api
+  </int>
+  <int value="68" label="disable-gpu-rasterization">
+    disable-gpu-rasterization
+  </int>
+  <int value="69" label="flag-switches-begin">flag-switches-begin</int>
+  <int value="70" label="disable-offline-load-stale-cache">
+    disable-offline-load-stale-cache
+  </int>
+  <int value="71" label="enable-virtual-keyboard">enable-virtual-keyboard</int>
+  <int value="72" label="disable-threaded-compositing">
+    disable-threaded-compositing
+  </int>
+  <int value="73" label="enable-gpu-rasterization">
+    enable-gpu-rasterization
+  </int>
+  <int value="74" label="disable-settings-window">disable-settings-window</int>
+  <int value="75" label="enable-delegated-renderer">
+    enable-delegated-renderer
+  </int>
+  <int value="76" label="enable-scroll-prediction">
+    enable-scroll-prediction
+  </int>
+  <int value="77" label="enable-accelerated-overflow-scroll">
+    enable-accelerated-overflow-scroll
+  </int>
+  <int value="78" label="disable-fixed-position-compositing">
+    disable-fixed-position-compositing
+  </int>
+  <int value="79" label="disable-webrtc-hw-encoding">
+    disable-webrtc-hw-encoding
+  </int>
+  <int value="80" label="enable-search-button-in-omnibox-for-str-or-iip">
+    enable-search-button-in-omnibox-for-str-or-iip
+  </int>
+  <int value="81" label="enable-bleeding-edge-rendering-fast-paths">
+    enable-bleeding-edge-rendering-fast-paths
+  </int>
+  <int value="82" label="disable-save-password-bubble">
+    disable-save-password-bubble
+  </int>
+  <int value="83" label="enable-settings-window">enable-settings-window</int>
+  <int value="84" label="disable-device-discovery">
+    disable-device-discovery
+  </int>
+  <int value="85" label="disable-zero-copy">disable-zero-copy</int>
+  <int value="86" label="enable-nacl-debug">enable-nacl-debug</int>
+  <int value="87" label="enable-save-password-bubble">
+    enable-save-password-bubble
+  </int>
+  <int value="88" label="disable-prefixed-encrypted-media">
+    disable-prefixed-encrypted-media
+  </int>
+  <int value="89" label="default-tile-width">default-tile-width</int>
+  <int value="90" label="disable-embedded-shared-worker">
+    disable-embedded-shared-worker
+  </int>
+  <int value="91" label="disable-session-crashed-bubble">
+    disable-session-crashed-bubble
+  </int>
+  <int value="92" label="enable-device-discovery-notifications">
+    enable-device-discovery-notifications
+  </int>
+  <int value="93" label="enable-carrier-switching">
+    enable-carrier-switching
+  </int>
+  <int value="94" label="enable-offline-load-stale-cache">
+    enable-offline-load-stale-cache
+  </int>
+  <int value="95" label="enable-answers-in-suggest">
+    enable-answers-in-suggest
+  </int>
+  <int value="96" label="enable-app-list">enable-app-list</int>
+  <int value="97" label="enable-pinch-virtual-viewport">
+    enable-pinch-virtual-viewport
+  </int>
+  <int value="98" label="disable-offline-auto-reload">
+    disable-offline-auto-reload
+  </int>
+  <int value="99" label="enable-fast-text-autosizing">
+    enable-fast-text-autosizing
+  </int>
+  <int value="100" label="enable-print-preview-register-promos">
+    enable-print-preview-register-promos
+  </int>
+  <int value="101" label="enable-threaded-compositing">
+    enable-threaded-compositing
+  </int>
+  <int value="102" label="enable-permissions-bubbles">
+    enable-permissions-bubbles
+  </int>
+  <int value="103" label="enable-easy-unlock">enable-easy-unlock</int>
+  <int value="104" label="disable-saml-signin">disable-saml-signin</int>
+  <int value="105" label="do-not-ignore-autocomplete-off">
+    do-not-ignore-autocomplete-off
+  </int>
+  <int value="106" label="disable-views-rect-based-targeting">
+    disable-views-rect-based-targeting
+  </int>
+  <int value="107" label="performance-monitor-gathering">
+    performance-monitor-gathering
+  </int>
+  <int value="108" label="show-composited-layer-borders">
+    show-composited-layer-borders
+  </int>
+  <int value="109" label="enable-input-view">enable-input-view</int>
+  <int value="110" label="wallet-service-use-sandbox">
+    wallet-service-use-sandbox
+  </int>
+  <int value="111" label="policy-switches-begin">policy-switches-begin</int>
+  <int value="112" label="enable-overlay-scrollbar">
+    enable-overlay-scrollbar
+  </int>
+  <int value="113" label="enable-account-consistency">
+    enable-account-consistency
+  </int>
+  <int value="114" label="disable-media-source">disable-media-source</int>
+  <int value="115" label="enable-service-worker">enable-service-worker</int>
+  <int value="116" label="enable-touch-editing">enable-touch-editing</int>
+  <int value="117" label="enable-translate-new-ux">enable-translate-new-ux</int>
+  <int value="118" label="force-device-scale-factor">
+    force-device-scale-factor
+  </int>
+  <int value="119" label="ash-debug-shortcuts">ash-debug-shortcuts</int>
+  <int value="120" label="disable-accelerated-2d-canvas">
+    disable-accelerated-2d-canvas
+  </int>
+  <int value="121" label="disable-suggestions-service">
+    disable-suggestions-service
+  </int>
+  <int value="122" label="num-raster-threads">num-raster-threads</int>
+  <int value="123" label="enable-automatic-password-saving">
+    enable-automatic-password-saving
+  </int>
+  <int value="124" label="enable-app-window-controls">
+    enable-app-window-controls
+  </int>
+  <int value="125" label="disable-quic">disable-quic</int>
+  <int value="126" label="disable-origin-chip">disable-origin-chip</int>
+  <int value="127" label="malware-interstitial-v3">malware-interstitial-v3</int>
+  <int value="128" label="touch-events">touch-events</int>
+  <int value="129" label="enable-experimental-input-view-features">
+    enable-experimental-input-view-features
+  </int>
+  <int value="130" label="disable-virtual-keyboard-overscroll">
+    disable-virtual-keyboard-overscroll
+  </int>
+  <int value="131" label="enable-async-dns">enable-async-dns</int>
+  <int value="132" label="google-profile-info">google-profile-info</int>
+  <int value="133" label="enable-experimental-web-platform-features">
+    enable-experimental-web-platform-features
+  </int>
+  <int value="134" label="enable-spelling-auto-correct">
+    enable-spelling-auto-correct
+  </int>
+  <int value="135" label="enable-web-midi">enable-web-midi</int>
+  <int value="136" label="enable-nacl">enable-nacl</int>
+  <int value="137" label="out-of-process-pdf">out-of-process-pdf</int>
+  <int value="138" label="disable-touch-adjustment">
+    disable-touch-adjustment
+  </int>
+  <int value="139" label="enable-prominent-url-app-flow">
+    enable-prominent-url-app-flow
+  </int>
+  <int value="140" label="enable-harfbuzz-rendertext">
+    enable-harfbuzz-rendertext
+  </int>
+  <int value="141" label="enable-origin-chip-always">
+    enable-origin-chip-always
+  </int>
+  <int value="142" label="disable-distance-field-text">
+    disable-distance-field-text
+  </int>
+  <int value="143" label="enable-text-input-focus-manager">
+    enable-text-input-focus-manager
+  </int>
+  <int value="144" label="fast-user-switching">fast-user-switching</int>
+  <int value="145" label="enable-encrypted-media">enable-encrypted-media</int>
+  <int value="146" label="disable-quic-https">disable-quic-https</int>
+  <int value="147" label="ssl-interstitial-v1">ssl-interstitial-v1</int>
+  <int value="148" label="enable-spdy4">enable-spdy4</int>
+  <int value="149" label="disable-permissions-bubbles">
+    disable-permissions-bubbles
+  </int>
+  <int value="150" label="new-avatar-menu">new-avatar-menu</int>
+  <int value="151" label="enable-high-dpi-fixed-position-compositing">
+    enable-high-dpi-fixed-position-compositing
+  </int>
+  <int value="152" label="enable-touch-drag-drop">enable-touch-drag-drop</int>
+  <int value="153" label="disable-lcd-text">disable-lcd-text</int>
+  <int value="154" label="enable-transition-compositing">
+    enable-transition-compositing
+  </int>
+  <int value="155" label="enable-impl-side-painting">
+    enable-impl-side-painting
+  </int>
+  <int value="156" label="ignore-gpu-blacklist">ignore-gpu-blacklist</int>
+  <int value="157" label="enabled">enabled</int>
+  <int value="158" label="enable-download-resumption">
+    enable-download-resumption
+  </int>
+  <int value="159" label="js-flags">js-flags</int>
+  <int value="160" label="disable-transition-compositing">
+    disable-transition-compositing
+  </int>
+  <int value="161" label="sync-touchmove">sync-touchmove</int>
+  <int value="162" label="enable-experimental-extension-apis">
+    enable-experimental-extension-apis
+  </int>
+  <int value="163" label="enable-gesture-tap-highlight">
+    enable-gesture-tap-highlight
+  </int>
+  <int value="164" label="nacl-debug-mask">nacl-debug-mask</int>
+  <int value="165" label="enhanced-bookmarks-experiment">
+    enhanced-bookmarks-experiment
+  </int>
+  <int value="166" label="enable-fast-unload">enable-fast-unload</int>
+  <int value="167" label="disable-boot-animation">disable-boot-animation</int>
+  <int value="168" label="disable-ntp-other-sessions-menu">
+    disable-ntp-other-sessions-menu
+  </int>
+  <int value="169" label="enable-origin-chip-on-srp">
+    enable-origin-chip-on-srp
+  </int>
+  <int value="170" label="disable-account-consistency">
+    disable-account-consistency
+  </int>
+  <int value="171" label="scroll-end-effect">scroll-end-effect</int>
+  <int value="172" label="touchcancel">touchcancel</int>
+  <int value="173" label="disable-pnacl">disable-pnacl</int>
+  <int value="174" label="ssl-interstitial-v2-colorful">
+    ssl-interstitial-v2-colorful
+  </int>
+  <int value="175" label="new-profile-management">new-profile-management</int>
+  <int value="176" label="enable-apps-show-on-first-paint">
+    enable-apps-show-on-first-paint
+  </int>
+  <int value="177" label="enable-pinch">enable-pinch</int>
+  <int value="178" label="reset-app-list-install-state">
+    reset-app-list-install-state
+  </int>
+  <int value="179" label="disable-impl-side-painting">
+    disable-impl-side-painting
+  </int>
+  <int value="180" label="disable-password-generation">
+    disable-password-generation
+  </int>
+  <int value="181" label="enable-experimental-canvas-features">
+    enable-experimental-canvas-features
+  </int>
+  <int value="182" label="enable-offline-auto-reload-visible-only">
+    enable-offline-auto-reload-visible-only
+  </int>
+  <int value="183" label="enable-streamlined-hosted-apps">
+    enable-streamlined-hosted-apps
+  </int>
+  <int value="184" label="async-touchmove">async-touchmove</int>
+  <int value="185" label="disable-touch-drag-drop">disable-touch-drag-drop</int>
+  <int value="186" label="enable-spdy-proxy-dev-auth-origin">
+    enable-spdy-proxy-dev-auth-origin
+  </int>
+  <int value="187" label="enable-spelling-feedback-field-trial">
+    enable-spelling-feedback-field-trial
+  </int>
+  <int value="188" label="tab-capture-upscale-quality">
+    tab-capture-upscale-quality
+  </int>
+  <int value="189" label="enable-lcd-text">enable-lcd-text</int>
+  <int value="190" label="enable-swipe-selection">enable-swipe-selection</int>
+  <int value="191" label="enable-webgl-draft-extensions">
+    enable-webgl-draft-extensions
+  </int>
+  <int value="192" label="enable-sync-synced-notifications">
+    enable-sync-synced-notifications
+  </int>
+  <int value="193" label="enable-cloud-devices">enable-cloud-devices</int>
+  <int value="194" label="bootstrap">bootstrap</int>
+  <int value="195" label="flag-switches-end">flag-switches-end</int>
+  <int value="196" label="disable-search-button-in-omnibox">
+    disable-search-button-in-omnibox
+  </int>
+  <int value="197" label="disable-offline-auto-reload-visible-only">
+    disable-offline-auto-reload-visible-only
+  </int>
+  <int value="198" label="policy-switches-end">policy-switches-end</int>
+  <int value="199" label="disable-webgl">disable-webgl</int>
+  <int value="200" label="enforce">enforce</int>
+  <int value="201" label="disable-layer-squashing">disable-layer-squashing</int>
+  <int value="202" label="extensions-on-chrome-urls">
+    extensions-on-chrome-urls
+  </int>
+  <int value="203" label="disable-network-portal-notification">
+    disable-network-portal-notification
+  </int>
+  <int value="204" label="ash-enable-touch-view-testing">
+    ash-enable-touch-view-testing
+  </int>
+  <int value="205" label="enable-touchpad-three-finger-click">
+    enable-touchpad-three-finger-click
+  </int>
+  <int value="206" label="file-manager-enable-new-audio-player">
+    file-manager-enable-new-audio-player
+  </int>
+  <int value="207" label="disable-fast-text-autosizing">
+    disable-fast-text-autosizing
+  </int>
+  <int value="208" label="disable-minimize-on-second-launcher-item-click">
+    disable-minimize-on-second-launcher-item-click
+  </int>
+  <int value="209" label="disable-webrtc-hw-decoding">
+    disable-webrtc-hw-decoding
+  </int>
+  <int value="210" label="disable-accelerated-video-decode">
+    disable-accelerated-video-decode
+  </int>
+  <int value="211" label="save-page-as-mhtml">save-page-as-mhtml</int>
+  <int value="212" label="disable-new-profile-management">
+    disable-new-profile-management
+  </int>
+  <int value="213" label="enable-zero-copy">enable-zero-copy</int>
+  <int value="214" label="enable-linkable-ephemeral-apps">
+    enable-linkable-ephemeral-apps
+  </int>
+  <int value="215" label="use-simple-cache-backend">
+    use-simple-cache-backend
+  </int>
+  <int value="216" label="enable-devtools-experiments">
+    enable-devtools-experiments
+  </int>
+  <int value="217" label="disable-sync-synced-notifications">
+    disable-sync-synced-notifications
+  </int>
+  <int value="218" label="disable-compositor-touch-hit-testing">
+    disable-compositor-touch-hit-testing
+  </int>
+  <int value="219" label="enable-accelerated-fixed-root-background">
+    enable-accelerated-fixed-root-background
+  </int>
+  <int value="220" label="enable-tcp-fastopen">enable-tcp-fastopen</int>
+  <int value="221" label="disable-async-dns">disable-async-dns</int>
+  <int value="222" label="enable-syncfs-directory-operation">
+    enable-syncfs-directory-operation
+  </int>
+  <int value="223" label="disable-spdy-proxy-dev-auth-origin">
+    disable-spdy-proxy-dev-auth-origin
+  </int>
+  <int value="224" label="disable-display-color-calibration">
+    disable-display-color-calibration
+  </int>
+  <int value="225" label="disable-accelerated-overflow-scroll">
+    disable-accelerated-overflow-scroll
+  </int>
+</enum>
+
 <enum name="LoginFailureReason" type="int">
   <int value="0" label="NONE">None</int>
   <int value="1" label="COULD_NOT_MOUNT_CRYPTOHOME">