Add supports that allow Autofill to be initiated from textarea field

components/autofill/content/renderer/autofill_agent.cc

Index: components/autofill/content/renderer/autofill_agent.cc
diff --git a/components/autofill/content/renderer/autofill_agent.cc b/components/autofill/content/renderer/autofill_agent.cc
index 5f3b03043eb0d6793db7fb47026ea428a26ab0ec..044aa12a6d82ba7ca7e08dc6be347a23fa8cece9 100644
--- a/components/autofill/content/renderer/autofill_agent.cc
+++ b/components/autofill/content/renderer/autofill_agent.cc
@@ -41,6 +41,7 @@
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "third_party/WebKit/public/web/WebNode.h"
 #include "third_party/WebKit/public/web/WebOptionElement.h"
+#include "third_party/WebKit/public/web/WebTextAreaElement.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/events/keycodes/keyboard_codes.h"
@@ -56,6 +57,7 @@ using blink::WebKeyboardEvent;
 using blink::WebNode;
 using blink::WebOptionElement;
 using blink::WebString;
+using blink::WebTextAreaElement;
 using blink::WebVector;
 
 namespace autofill {
@@ -296,14 +298,18 @@ void AutofillAgent::setIgnoreTextChanges(bool ignore) {
   ignore_text_changes_ = ignore;
 }
 
-void AutofillAgent::InputElementClicked(const WebInputElement& element,
-                                        bool was_focused,
-                                        bool is_focused) {
+void AutofillAgent::FormControlElementClicked(
+    const WebFormControlElement& element,
+    bool was_focused) {
+  const WebInputElement* input_element = toWebInputElement(&element);
+  if (!input_element && !IsTextAreaElement(element))
+    return;
+
   if (was_focused)
     ShowSuggestions(element, true, false, true, false);
 }
 
-void AutofillAgent::InputElementLostFocus() {
+void AutofillAgent::FormControlElementLostFocus() {
   HidePopup();
 }
 
@@ -313,10 +319,19 @@ void AutofillAgent::textFieldDidEndEditing(const WebInputElement& element) {
   Send(new AutofillHostMsg_DidEndTextFieldEditing(routing_id()));
 }
 
+// TODO(ziran.sun): This function is to be removed once next Blink roll is done
 void AutofillAgent::textFieldDidChange(const WebInputElement& element) {
+  const WebFormControlElement control_element =
+      element.toConst<WebFormControlElement>();
+  textFieldDidChange(control_element);
+}
+
+void AutofillAgent::textFieldDidChange(const WebFormControlElement& element) {
   if (ignore_text_changes_)
     return;
 
+  DCHECK(toWebInputElement(&element) || IsTextAreaElement(element));
+
   if (did_set_node_text_) {
     did_set_node_text_ = false;
     return;
@@ -333,27 +348,34 @@ void AutofillAgent::textFieldDidChange(const WebInputElement& element) {
                  element));
 }
 
-void AutofillAgent::TextFieldDidChangeImpl(const WebInputElement& element) {
+void AutofillAgent::TextFieldDidChangeImpl(
+    const WebFormControlElement& element) {
   // If the element isn't focused then the changes don't matter. This check is
   // required to properly handle IME interactions.
   if (!element.focused())
     return;
 
-  if (password_generation_agent_ &&
-      password_generation_agent_->TextDidChangeInTextField(element)) {
-    return;
-  }
+  const WebInputElement* input_element = toWebInputElement(&element);
+  if (input_element) {
+    if (password_generation_agent_ &&
+        password_generation_agent_->TextDidChangeInTextField(*input_element)) {
+      return;
+    }
 
-  if (password_autofill_agent_->TextDidChangeInTextField(element)) {
-    element_ = element;
-    return;
+    if (password_autofill_agent_->TextDidChangeInTextField(*input_element)) {
+      element_ = element;
+      return;
+    }
   }
 
   ShowSuggestions(element, false, true, false, false);
 
   FormData form;
   FormFieldData field;
-  if (FindFormAndFieldForInputElement(element, &form, &field, REQUIRE_NONE)) {
+  if (FindFormAndFieldForFormControlElement(element,
+                                            &form,
+                                            &field,
+                                            REQUIRE_NONE)) {
     Send(new AutofillHostMsg_TextFieldDidChange(routing_id(), form, field,
                                                 base::TimeTicks::Now()));
   }
@@ -377,14 +399,16 @@ void AutofillAgent::openTextDataListChooser(const WebInputElement& element) {
 
 void AutofillAgent::AcceptDataListSuggestion(
     const base::string16& suggested_value) {
+  WebInputElement* input_element = toWebInputElement(&element_);
+  DCHECK(input_element);
   base::string16 new_value = suggested_value;
   // If this element takes multiple values then replace the last part with
   // the suggestion.
-  if (element_.isMultiple() &&
-      element_.formControlType() == WebString::fromUTF8("email")) {
+  if (input_element->isMultiple() &&
+      input_element->formControlType() == WebString::fromUTF8("email")) {
     std::vector<base::string16> parts;
 
-    base::SplitStringDontTrim(element_.editingValue(), ',', &parts);
+    base::SplitStringDontTrim(input_element->editingValue(), ',', &parts);
     if (parts.size() == 0)
       parts.push_back(base::string16());
 
@@ -401,7 +425,7 @@ void AutofillAgent::AcceptDataListSuggestion(
 
     new_value = JoinString(parts, ',');
   }
-  FillFieldWithValue(new_value, &element_);
+  FillFieldWithValue(new_value, input_element);
 }
 
 void AutofillAgent::OnFieldTypePredictionsAvailable(
@@ -451,11 +475,15 @@ void AutofillAgent::OnClearPreviewedForm() {
 }
 
 void AutofillAgent::OnFillFieldWithValue(const base::string16& value) {
-  FillFieldWithValue(value, &element_);
+  WebInputElement* input_element = toWebInputElement(&element_);
+  if (input_element)
+    FillFieldWithValue(value, input_element);
 }
 
 void AutofillAgent::OnPreviewFieldWithValue(const base::string16& value) {
-  PreviewFieldWithValue(value, &element_);
+  WebInputElement* input_element = toWebInputElement(&element_);
+  if (input_element)
+    PreviewFieldWithValue(value, input_element);
 }
 
 void AutofillAgent::OnAcceptDataListSuggestion(const base::string16& value) {
@@ -489,17 +517,26 @@ void AutofillAgent::OnRequestAutocompleteResult(
   in_flight_request_form_.reset();
 }
 
-void AutofillAgent::ShowSuggestions(const WebInputElement& element,
+void AutofillAgent::ShowSuggestions(const WebFormControlElement& element,
                                     bool autofill_on_empty_values,
                                     bool requires_caret_at_end,
                                     bool display_warning_if_disabled,
                                     bool datalist_only) {
-  if (!element.isEnabled() || element.isReadOnly() || !element.isTextField() ||
-      element.isPasswordField())
-    return;
-  if (!datalist_only && !element.suggestedValue().isEmpty())
+  if (!element.isEnabled() || element.isReadOnly())
     return;
 
+  const WebInputElement* input_element = toWebInputElement(&element);
+  if (input_element) {
+    if (!input_element->isTextField() || input_element->isPasswordField())
+      return;
+    if (!datalist_only && !input_element->suggestedValue().isEmpty())
+      return;
+  } else {
+    DCHECK(IsTextAreaElement(element));
+    if (!element.toConst<WebTextAreaElement>().suggestedValue().isEmpty())
+      return;
+  }
+
   // Don't attempt to autofill with values that are too large or if filling
   // criteria are not met.
   WebString value = element.editingValue();
@@ -515,7 +552,8 @@ void AutofillAgent::ShowSuggestions(const WebInputElement& element,
   }
 
   element_ = element;
-  if (password_autofill_agent_->ShowSuggestions(element)) {
+  if (input_element &&
+      password_autofill_agent_->ShowSuggestions(*input_element)) {
     is_popup_possibly_visible_ = true;
     return;
   }
@@ -535,12 +573,15 @@ void AutofillAgent::ShowSuggestions(const WebInputElement& element,
                            datalist_only);
 }
 
-void AutofillAgent::QueryAutofillSuggestions(const WebInputElement& element,
-                                             bool display_warning_if_disabled,
-                                             bool datalist_only) {
+void AutofillAgent::QueryAutofillSuggestions(
+    const WebFormControlElement& element,
+    bool display_warning_if_disabled,
+    bool datalist_only) {
   if (!element.document().frame())
     return;
 
+  DCHECK(toWebInputElement(&element) || IsTextAreaElement(element));
+
   static int query_counter = 0;
   autofill_query_id_ = query_counter++;
   display_warning_if_disabled_ = display_warning_if_disabled;
@@ -555,7 +596,8 @@ void AutofillAgent::QueryAutofillSuggestions(const WebInputElement& element,
 
   FormData form;
   FormFieldData field;
-  if (!FindFormAndFieldForInputElement(element, &form, &field, requirements)) {
+  if (!FindFormAndFieldForFormControlElement(element, &form, &field,
+                                             requirements)) {
     // If we didn't find the cached form, at least let autocomplete have a shot
     // at providing suggestions.
     WebFormControlElementToFormField(element, EXTRACT_VALUE, &field);
@@ -566,21 +608,24 @@ void AutofillAgent::QueryAutofillSuggestions(const WebInputElement& element,
   gfx::RectF bounding_box_scaled =
       GetScaledBoundingBox(web_view_->pageScaleFactor(), &element_);
 
-  // Find the datalist values and send them to the browser process.
-  std::vector<base::string16> data_list_values;
-  std::vector<base::string16> data_list_labels;
-  GetDataListSuggestions(element_,
-                         datalist_only,
-                         &data_list_values,
-                         &data_list_labels);
-  TrimStringVectorForIPC(&data_list_values);
-  TrimStringVectorForIPC(&data_list_labels);
+  const WebInputElement* input_element = toWebInputElement(&element);
+  if (input_element) {
+    // Find the datalist values and send them to the browser process.
+    std::vector<base::string16> data_list_values;
+    std::vector<base::string16> data_list_labels;
+    GetDataListSuggestions(*input_element,
+                           datalist_only,
+                           &data_list_values,
+                           &data_list_labels);
+    TrimStringVectorForIPC(&data_list_values);
+    TrimStringVectorForIPC(&data_list_labels);
+
+    Send(new AutofillHostMsg_SetDataList(routing_id(),
+                                         data_list_values,
+                                         data_list_labels));
+  }
 
   is_popup_possibly_visible_ = true;
-  Send(new AutofillHostMsg_SetDataList(routing_id(),
-                                       data_list_values,
-                                       data_list_labels));
-
   Send(new AutofillHostMsg_QueryFormFieldAutofill(routing_id(),
                                                   autofill_query_id_,
                                                   form,