Roll chromium to 508268 (#1019)

This gets us:

- Plural metrics names https://crrev.com/507885
- TargetInfoChanged on URL changes https://crrev.com/508049
- Sending proper resource types for requests https://crrev.com/667504

Fixes #734

docs/api.md

@@ -671,10 +671,10 @@ If there's no element matching `selector`, the method throws an error.
 #### page.getMetrics()
 - returns: <[Object]> Object containing metrics as key/value pairs.
   - `Timestamp` <[number]> The timestamp when the metrics sample was taken.
-  - `DocumentCount` <[number]> Number of documents in the page.
-  - `FrameCount` <[number]> Number of frames in the page.
-  - `JSEventListenerCount` <[number]> Number of events in the page.
-  - `NodeCount` <[number]> Number of DOM nodes in the page.
+  - `Documents` <[number]> Number of documents in the page.
+  - `Frames` <[number]> Number of frames in the page.
+  - `JSEventListeners` <[number]> Number of events in the page.
+  - `Nodes` <[number]> Number of DOM nodes in the page.
   - `LayoutCount` <[number]> Total number of full or partial page layout.
   - `RecalcStyleCount` <[number]> Total number of page style recalculations.
   - `LayoutDuration` <[number]> Combined durations of all page layouts.

lib/Page.js

@@ -832,10 +832,10 @@ class Page extends EventEmitter {
 /** @type {!Set<string>} */
 const supportedMetrics = new Set([
   'Timestamp',
-  'DocumentCount',
-  'FrameCount',
-  'JSEventListenerCount',
-  'NodeCount',
+  'Documents',
+  'Frames',
+  'JSEventListeners',
+  'Nodes',
   'LayoutCount',
   'RecalcStyleCount',
   'LayoutDuration',

package.json

@@ -34,7 +34,7 @@
     "ws": "^3.0.0"
   },
   "puppeteer": {
-    "chromium_revision": "507565"
+    "chromium_revision": "508268"
   },
   "devDependencies": {
     "@types/debug": "0.0.30",

test/test.js

@@ -796,10 +796,10 @@ describe('Page', function() {
     function checkMetrics(metrics) {
       const metricsToCheck = new Set([
         'Timestamp',
-        'DocumentCount',
-        'FrameCount',
-        'JSEventListenerCount',
-        'NodeCount',
+        'Documents',
+        'Frames',
+        'JSEventListeners',
+        'Nodes',
         'LayoutCount',
         'RecalcStyleCount',
         'LayoutDuration',