Add support for components/ntp_tiles in InstantService

chrome/renderer/searchbox/searchbox_extension.cc

Index: chrome/renderer/searchbox/searchbox_extension.cc
diff --git a/chrome/renderer/searchbox/searchbox_extension.cc b/chrome/renderer/searchbox/searchbox_extension.cc
index fe57fb31c84bb834d79efd47457ef2d545dc6a8d..d86f66ec9fa89c7f406a2f216fb2dbbec5720107 100644
--- a/chrome/renderer/searchbox/searchbox_extension.cc
+++ b/chrome/renderer/searchbox/searchbox_extension.cc
@@ -169,6 +169,7 @@ v8::Local<v8::Object> GenerateMostVisitedItem(
   // Otherwise, we just create an array with the generated one.
   if (!mv_item.thumbnail.spec().empty()) {
     v8::Local<v8::Array> thumbs = v8::Array::New(isolate, 2);
+    // Note: The "thumb2" source captures a thumbnail on the next visit.
     thumbs->Set(0, GenerateThumb2URL(isolate, mv_item.url.spec()));
     thumbs->Set(1, UTF8ToV8String(isolate, mv_item.thumbnail.spec()));
     obj->Set(v8::String::NewFromUtf8(isolate, "thumbnailUrls"), thumbs);
@@ -185,6 +186,9 @@ v8::Local<v8::Object> GenerateMostVisitedItem(
              UTF8ToV8String(isolate, mv_item.favicon.spec()));
   }
 
+  obj->Set(v8::String::NewFromUtf8(isolate, "tileSource"),
+           v8::Integer::New(isolate, static_cast<int>(mv_item.source)));
+
   if (IsIconNTPEnabled()) {
     // Update website http://www.chromium.org/embeddedsearch when we make this
     // permanent.