PlzNavigate: send searchable form data to the browser side on form submission.

third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp

Index: third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp b/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
index 3c728c67ba727ae36b0784b044b4c7c30657fe75..2081e50930d46df5178f439c030e0c500b6519f8 100644
--- a/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
+++ b/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
@@ -520,7 +520,8 @@ NavigationPolicy FrameLoaderClientImpl::decidePolicyForNavigation(
     NavigationType type,
     NavigationPolicy policy,
     bool replacesCurrentHistoryItem,
-    bool isClientRedirect) {
+    bool isClientRedirect,
+    HTMLFormElement* form) {
   if (!m_webFrame->client())
     return NavigationPolicyIgnore;
 
@@ -556,6 +557,8 @@ NavigationPolicy FrameLoaderClientImpl::decidePolicyForNavigation(
   navigationInfo.isHistoryNavigationInNewChildFrame =
       isHistoryNavigationInNewChildFrame;
   navigationInfo.isClientRedirect = isClientRedirect;
+  if (form)
+    navigationInfo.form = WebFormElement(form);
 
   WebNavigationPolicy webPolicy =
       m_webFrame->client()->decidePolicyForNavigation(navigationInfo);