Add supports that allow Autofill to be initiated from textarea field

components/autofill/content/renderer/page_click_tracker.cc

Index: components/autofill/content/renderer/page_click_tracker.cc
diff --git a/components/autofill/content/renderer/page_click_tracker.cc b/components/autofill/content/renderer/page_click_tracker.cc
index 9e2f649f023a15a00f2f7c6b42e5231b8242d565..56a40d88651710d9819efa0223d9199cd2cbed35 100644
--- a/components/autofill/content/renderer/page_click_tracker.cc
+++ b/components/autofill/content/renderer/page_click_tracker.cc
@@ -13,6 +13,7 @@
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebInputElement.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
+#include "third_party/WebKit/public/web/WebTextAreaElement.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 using blink::WebDOMEvent;
@@ -25,6 +26,7 @@ using blink::WebInputEvent;
 using blink::WebMouseEvent;
 using blink::WebNode;
 using blink::WebString;
+using blink::WebTextAreaElement;
 using blink::WebView;
 
 namespace {
@@ -43,12 +45,32 @@ const WebInputElement GetTextWebInputElement(const WebNode& node) {
   return *input;
 }
 
+// Casts |node| to a WebTextAreaElement.
+// Returns an empty (isNull()) WebTextAreaElement if |node| is not a
+// textarea field.
+const WebTextAreaElement GetTextWebTextAreaElement(const WebNode& node) {
+  if (!node.isElementNode())
+    return WebTextAreaElement();
+  const WebElement element = node.toConst<WebElement>();
+  if (!element.hasTagName("textarea"))
+    return WebTextAreaElement();
+  const WebFormControlElement& controlElement =
+      element.toConst<WebFormControlElement>();
+  if (!autofill::IsTextAreaElement(controlElement))
+    return WebTextAreaElement();
+  const WebTextAreaElement text_area =
+      controlElement.toConst<WebTextAreaElement>();
+  return text_area;
+}
+
 // Checks to see if a text field was the previously selected node and is now
 // losing its focus.
 bool DidSelectedTextFieldLoseFocus(const WebNode& newly_clicked_node) {
   blink::WebNode focused_node = newly_clicked_node.document().focusedNode();
 
-  if (focused_node.isNull() || GetTextWebInputElement(focused_node).isNull())
+  if (focused_node.isNull() ||
+      (GetTextWebInputElement(focused_node).isNull() &&
+       GetTextWebTextAreaElement(focused_node).isNull()))
     return false;
 
   return focused_node != newly_clicked_node;
@@ -80,14 +102,20 @@ void PageClickTracker::DidHandleMouseEvent(const WebMouseEvent& event) {
     return;
   }
 
-  // We are only interested in text field clicks.
+  // We are only interested in text field and textarea field clicks.
   const WebInputElement input_element =
       GetTextWebInputElement(last_node_clicked_);
-  if (input_element.isNull())
+  const WebTextAreaElement textarea_element =
+      GetTextWebTextAreaElement(last_node_clicked_);
+  if (input_element.isNull() && textarea_element.isNull())
     return;
 
   bool is_focused = (last_node_clicked_ == render_view()->GetFocusedNode());
-  listener_->InputElementClicked(input_element, was_focused_, is_focused);
+  if (!input_element.isNull())
+      listener_->InputElementClicked(input_element, was_focused_, is_focused);
+  if (!textarea_element.isNull())
+      listener_->TextAreaElementClicked(textarea_element,
+                                        was_focused_, is_focused);
 }
 
 void PageClickTracker::DidFinishDocumentLoad(blink::WebFrame* frame) {
@@ -130,7 +158,8 @@ void PageClickTracker::handleEvent(const WebDOMEvent& event) {
   HandleTextFieldMaybeLosingFocus(node);
 
   // We are only interested in text field clicks.
-  if (GetTextWebInputElement(node).isNull())
+  if (GetTextWebInputElement(node).isNull() &&
+      GetTextWebTextAreaElement(node).isNull())
     return;
 
   last_node_clicked_ = node;
@@ -140,7 +169,7 @@ void PageClickTracker::handleEvent(const WebDOMEvent& event) {
 void PageClickTracker::HandleTextFieldMaybeLosingFocus(
     const WebNode& newly_clicked_node) {
   if (DidSelectedTextFieldLoseFocus(newly_clicked_node))
-    listener_->InputElementLostFocus();
+    listener_->FormControlElementLostFocus();
 }
 
 }  // namespace autofill