[wrapper-tracing] Reland: Turn on flag TraceWrappables

BUG=chromium:468240
TBR=jochen@chromium.org,haraken@chromium.org,hlopko@chromium.org

Review-Url: https://codereview.chromium.org/2592713002
Cr-Commit-Position: refs/heads/master@{#439865}

third_party/WebKit/LayoutTests/fast/dom/NodeList/nodelist-reachable-expected.txt

@@ -2,7 +2,7 @@ PASS document.body.childNodes.customProperty is 1
 PASS document.getElementsByClassName("class").customProperty is 2
 PASS document.getElementsByName("name").customProperty is 3
 PASS document.getElementsByTagName("body").customProperty is 4
-FAIL document.querySelector("form").elements["radios"].customProperty should be 5 (of type number). Was undefined (of type undefined).
+PASS document.querySelector("form").elements["radios"].customProperty is 5
 PASS document.querySelector("input").labels.customProperty is 6
 PASS successfullyParsed is true
 

third_party/WebKit/LayoutTests/fast/xmlhttprequest/xmlhttprequest-responsetype-arraybuffer-expected.txt

@@ -23,7 +23,7 @@ bytes at offset 670166 : 8 be 3 c 6 91 2 8
 checksum : 84637740
 PASS exception correctly thrown when xhr.responseText is accessed but responseType is 'arraybuffer' : InvalidStateError: Failed to read the 'responseText' property from 'XMLHttpRequest': The value is only accessible if the object's 'responseType' is '' or 'text' (was 'arraybuffer')..
 PASS exception correctly thrown when xhr.responseXML is accessed but responseType is 'arraybuffer' : InvalidStateError: Failed to read the 'responseXML' property from 'XMLHttpRequest': The value is only accessible if the object's 'responseType' is '' or 'document' (was 'arraybuffer')..
-FAIL xhr.response.foo should be bar (of type string). Was undefined (of type undefined).
+PASS xhr.response.foo is 'bar'
 PASS successfullyParsed is true
 
 TEST COMPLETE

third_party/WebKit/LayoutTests/http/tests/inspector/search/sources-search-scope-in-files-expected.txt

 Tests that ScriptSearchScope performs search across all sources correctly.
 
 See bug 41350.
-Total uiSourceCodes: 13
+Total uiSourceCodes: 14
 
 Running: testIgnoreCase
 Search result #1: uiSourceCode.url = file:///var/www/search.css

third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in

@@ -246,7 +246,7 @@ TimerThrottlingForHiddenFrames status=stable
 // touchscreen) in ApplyWebPreferences. "Touch events" themselves are always
 // enabled since they're a feature always supported by Chrome.
 TouchEventFeatureDetection status=stable
-TraceWrappables
+TraceWrappables status=stable
 TrueColorRendering status=experimental
 TrustedEventsDefaultAction status=stable
 UserSelectAll status=stable