Specify TaskType of posted Task explicitly in forms

These tasks should be posted as TaskType::UserInteraction as specified
on the spec.
https://html.spec.whatwg.org/multipage/forms.html#common-input-element-events

BUG=624696

Review-Url: https://codereview.chromium.org/2580243002
Cr-Commit-Position: refs/heads/master@{#439386}

third_party/WebKit/Source/core/html/HTMLInputElement.cpp

@@ -41,6 +41,7 @@
 #include "core/dom/ExecutionContextTask.h"
 #include "core/dom/IdTargetObserver.h"
 #include "core/dom/StyleChangeReason.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/dom/shadow/InsertionPoint.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/FrameSelection.h"
@@ -1263,7 +1264,7 @@ void HTMLInputElement::defaultEventHandler(Event* evt) {
   if (m_inputTypeView->shouldSubmitImplicitly(evt)) {
     // FIXME: Remove type check.
     if (type() == InputTypeNames::search)
-      document().postTask(BLINK_FROM_HERE,
+      document().postTask(TaskType::UserInteraction, BLINK_FROM_HERE,
                           createSameThreadTask(&HTMLInputElement::onSearch,
                                                wrapPersistent(this)));
     // Form submission finishes editing, just as loss of focus does.

third_party/WebKit/Source/core/html/HTMLSelectElement.cpp

@@ -46,6 +46,7 @@
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/NodeListsNodeData.h"
 #include "core/dom/NodeTraversal.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/events/GestureEvent.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/events/MouseEvent.h"
@@ -897,7 +898,7 @@ void HTMLSelectElement::scrollToOption(HTMLOptionElement* option) {
   m_optionToScrollTo = option;
   if (!hasPendingTask)
     document().postTask(
-        BLINK_FROM_HERE,
+        TaskType::UserInteraction, BLINK_FROM_HERE,
         createSameThreadTask(&HTMLSelectElement::scrollToOptionTask,
                              wrapPersistent(this)));
 }

third_party/WebKit/Source/core/html/forms/SearchInputType.cpp

@@ -34,6 +34,7 @@
 #include "core/HTMLNames.h"
 #include "core/InputTypeNames.h"
 #include "core/dom/ExecutionContextTask.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/html/HTMLInputElement.h"
@@ -104,8 +105,9 @@ void SearchInputType::startSearchEventTimer() {
   if (!length) {
     m_searchEventTimer.stop();
     element().document().postTask(
-        BLINK_FROM_HERE, createSameThreadTask(&HTMLInputElement::onSearch,
-                                              wrapPersistent(&element())));
+        TaskType::UserInteraction, BLINK_FROM_HERE,
+        createSameThreadTask(&HTMLInputElement::onSearch,
+                             wrapPersistent(&element())));
     return;
   }