Adding support for Smart GO NEXT feature in Android Chrome

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 24c6618d60dcf9d6305107730de5e7ca771ec25f..49b7fa35261ba6d33b89dbdeb5650a9d63280af1 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -116,6 +116,7 @@
 #include "public/platform/WebCompositeAndReadbackAsyncCallback.h"
 #include "public/platform/WebDragData.h"
 #include "public/platform/WebFloatPoint.h"
+#include "public/platform/WebFocusType.h"
 #include "public/platform/WebGestureCurve.h"
 #include "public/platform/WebImage.h"
 #include "public/platform/WebLayerTreeView.h"
@@ -2515,9 +2516,67 @@ int WebViewImpl::textInputFlags()
         }
     }
 
+    if (wantEnterEvents(element)) {
+        flags |= WebTextInputFlagWantEnterEvents;
+    }
+
+    if (haveNextInput(element, WebFocusTypeForward)) {
+        flags |= WebTextInputFlagHaveNextInput;
+    }
+
+    if (haveNextInput(element, WebFocusTypeBackward)) {
+        flags |= WebTextInputFlagHavePreviousInput;
+    }
+
     return flags;
 }
 
+Element* WebViewImpl::haveNextInput(Element* element, WebFocusType focusType)
+{
+    if (!element->isFormControlElement())
+        return nullptr;
+
+    HTMLFormControlElement* formControlElement = toHTMLFormControlElement(element);
+    Node* parentFormNode = reinterpret_cast<Node*>(formControlElement->formOwner());
+    if (!parentFormNode)
+        return nullptr;
+
+    Node* nextNode = element;
+    while ((nextNode = page()->focusController().findFocusableNode(focusType, parentFormNode, *nextNode))) {
+        LayoutObject* layout = nextNode->layoutObject();
+        if (nextNode->isContentEditable() || (layout && layout->isTextControl())) {
+            // TODO(AKV) Extend it for Select element, Radio button and Check boxes
+            if (nextNode->isElementNode())
+                return toElement(nextNode);
+        }
+        // TODO(AKV) Need to handle when form has an iframe/frame as its child.
+    }
+    return nullptr;
+}
+
+bool WebViewImpl::wantEnterEvents(Element* element)
+{
+    if (!element->isFormControlElement())
+        return false;
+
+    return (element->hasEventListeners(EventTypeNames::keydown) || element->hasEventListeners(EventTypeNames::keypress) || element->hasEventListeners(EventTypeNames::keystatuseschange) || element->hasEventListeners(EventTypeNames::keyup));
+}
+
+void WebViewImpl::advanceFocusToNextInputField(WebFocusType focusType)
+{
+    Element* element = focusedElement();
+    if (!element)
+        return;
+
+    Element* nextElement = haveNextInput(element, focusType);
+    if (!nextElement)
+        return;
+
+    nextElement->scrollIntoViewIfNeeded(true /*centerIfNeeded*/);
+    nextElement->dispatchSimulatedClick(0, SendMouseUpDownEvents);
+    nextElement->focus(false, focusType);
+}
+
 WebString WebViewImpl::inputModeOfFocusedElement()
 {
     if (!RuntimeEnabledFeatures::inputModeAttributeEnabled())