Noted the Android WebView metrics inclusion (#537)

* Added a note about included WebView metrics

* Added a note for the metrics spike around 2018-3-20

* Added a note for the metrics spike around 2018-3-20

* Added a note for the metrics spike around 2018-3-20

static/elements/chromedash-timeline.html

@@ -90,6 +90,8 @@
         // Add annotation where UMA data switched to new stuff.
         if (item.date === '2017-10-27') {
           row.push('A', 'Modernized metrics');
+        } else if (item.date === '2018-03-20') {
+          row.push('B', 'WebView included');
         } else {
           row.push(null, null);
         }

templates/metrics/css/timeline/animated.html

@@ -31,6 +31,11 @@
     which is <a href="https://groups.google.com/a/chromium.org/forum/#!msg/blink-api-owners-discuss/IpIkbz0qtrM/HUCfSMv2AQAJ" target="_blank">more accurate</a>.
     This is also the reason for the abrupt spike around 2017-10-26.
   </p>
+  <p class="callout">
+    <b>Note</b>: on 2018-03-19 Android WebView
+    <a href="https://groups.google.com/a/chromium.org/d/msg/blink-api-owners-discuss/CHEFTQ65WEA/HWC6JS7bBwAJ" target="_blank">has started reporting usage metrics</a> as well.
+    This is also the reason for the abrupt spike around 2018-03-19.
+  </p>
 </div>
 {% endblock %}
 

templates/metrics/css/timeline/popularity.html

@@ -32,6 +32,11 @@
     which is <a href="https://groups.google.com/a/chromium.org/forum/#!msg/blink-api-owners-discuss/IpIkbz0qtrM/HUCfSMv2AQAJ" target="_blank">more accurate</a>.
     This is also the reason for the abrupt spike around 2017-10-26.
   </p>
+  <p class="callout">
+    <b>Note</b>: on 2018-03-19 Android WebView
+    <a href="https://groups.google.com/a/chromium.org/d/msg/blink-api-owners-discuss/CHEFTQ65WEA/HWC6JS7bBwAJ" target="_blank">has started reporting usage metrics</a> as well.
+    This is also the reason for the abrupt spike around 2018-03-19.
+  </p>
 </div>
 {% endblock %}
 

templates/metrics/feature/timeline/popularity.html

@@ -38,6 +38,11 @@
     which is <a href="https://groups.google.com/a/chromium.org/forum/#!msg/blink-api-owners-discuss/IpIkbz0qtrM/HUCfSMv2AQAJ" target="_blank">more accurate</a>.
     This is also the reason for the abrupt spike around 2017-10-26.
   </p>
+  <p class="callout">
+    <b>Note</b>: on 2018-03-19 Android WebView
+    <a href="https://groups.google.com/a/chromium.org/d/msg/blink-api-owners-discuss/CHEFTQ65WEA/HWC6JS7bBwAJ" target="_blank">has started reporting usage metrics</a> as well.
+    This is also the reason for the abrupt spike around 2018-03-19.
+  </p>
 </div>
 {% endblock %}