Add Android AX functions to set the value and selection of a text field.

content/browser/accessibility/browser_accessibility_android.cc

Index: content/browser/accessibility/browser_accessibility_android.cc
diff --git a/content/browser/accessibility/browser_accessibility_android.cc b/content/browser/accessibility/browser_accessibility_android.cc
index 2774d096b5b07d1ac8cb429e326d4a33b6b77b8d..0f9b9078522920a84d853a862a35313b7d0907ce 100644
--- a/content/browser/accessibility/browser_accessibility_android.cc
+++ b/content/browser/accessibility/browser_accessibility_android.cc
@@ -143,6 +143,12 @@ bool BrowserAccessibilityAndroid::IsDismissable() const {
   return false;  // No concept of "dismissable" on the web currently.
 }
 
+bool BrowserAccessibilityAndroid::IsEditableText() const {
+  return (GetRole() == ui::AX_ROLE_EDITABLE_TEXT ||
+          GetRole() == ui::AX_ROLE_TEXT_AREA ||
+          GetRole() == ui::AX_ROLE_TEXT_FIELD);
+}
+
 bool BrowserAccessibilityAndroid::IsEnabled() const {
   return HasState(ui::AX_STATE_ENABLED);
 }