[Icons NTP] Working prototype to fetch, store, and display big icons.

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 cbcd71c858797c417d0e48d49cd54b8adc246f35..dee7ea9b91229a3cfa34e4d41d470b5c58b4a736 100644
--- a/chrome/renderer/searchbox/searchbox_extension.cc
+++ b/chrome/renderer/searchbox/searchbox_extension.cc
@@ -92,6 +92,27 @@ v8::Handle<v8::String> GenerateThumbnailURL(
           "chrome-search://thumb/%d/%d", render_view_id, most_visited_item_id));
 }
 
+v8::Handle<v8::String> GenerateBigIconURL(
+    v8::Isolate* isolate,
+    int render_view_id,
+    InstantRestrictedID most_visited_item_id) {
+  int size = 48;
+  return UTF8ToV8String(
+      isolate,
+      base::StringPrintf("chrome-search://big-icon/%d/%d/%d",
+                         size, render_view_id, most_visited_item_id));
+}
+
+v8::Handle<v8::String> GenerateFallbackIconURL(
+    v8::Isolate* isolate,
+    int render_view_id,
+    InstantRestrictedID most_visited_item_id) {
+  return UTF8ToV8String(
+      isolate,
+      base::StringPrintf("chrome-search://fallback-icon/,,,,1/%d/%d",
+                         render_view_id, most_visited_item_id));
+}
+
 // Populates a Javascript MostVisitedItem object from |mv_item|.
 // NOTE: Includes "url", "title" and "domain" which are private data, so should
 // not be returned to the Instant page. These should be erased before returning
@@ -122,6 +143,8 @@ v8::Handle<v8::Object> GenerateMostVisitedItem(
   if (title.empty())
     title = base::UTF8ToUTF16(mv_item.url.spec());
 
+  bool use_big_icon = true;
+
   v8::Handle<v8::Object> obj = v8::Object::New(isolate);
   obj->Set(v8::String::NewFromUtf8(isolate, "renderViewId"),
            v8::Int32::New(isolate, render_view_id));
@@ -129,6 +152,12 @@ v8::Handle<v8::Object> GenerateMostVisitedItem(
            v8::Int32::New(isolate, restricted_id));
   obj->Set(v8::String::NewFromUtf8(isolate, "thumbnailUrl"),
            GenerateThumbnailURL(isolate, render_view_id, restricted_id));
+  if (use_big_icon) {
+    obj->Set(v8::String::NewFromUtf8(isolate, "bigIconUrl"),
+             GenerateBigIconURL(isolate, render_view_id, restricted_id));
+    obj->Set(v8::String::NewFromUtf8(isolate, "fallbackIconUrl"),
+             GenerateFallbackIconURL(isolate, render_view_id, restricted_id));
+  }
   obj->Set(v8::String::NewFromUtf8(isolate, "title"),
            UTF16ToV8String(isolate, title));
   obj->Set(v8::String::NewFromUtf8(isolate, "domain"),