Support having javascript return dictionaries.

ios/web/web_state/ui/web_view_js_utils.mm

Index: ios/web/web_state/ui/web_view_js_utils.mm
diff --git a/ios/web/web_state/ui/web_view_js_utils.mm b/ios/web/web_state/ui/web_view_js_utils.mm
index 48d65aac362036905e388e4e92a6f1bf3284afbb..36f0cb4a65a3e43ebed9fa4eecc76cec1c50727f 100644
--- a/ios/web/web_state/ui/web_view_js_utils.mm
+++ b/ios/web/web_state/ui/web_view_js_utils.mm
@@ -9,6 +9,7 @@
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/values.h"
 
@@ -62,6 +63,16 @@ std::unique_ptr<base::Value> ValueResultFromWKResult(id wk_result) {
   } else if (result_type == CFNullGetTypeID()) {
     result = base::Value::CreateNullValue();
     DCHECK(result->IsType(base::Value::TYPE_NULL));
+  } else if (result_type == CFDictionaryGetTypeID()) {
+    std::unique_ptr<base::DictionaryValue> dictionnary =

[marq (ping after 24h), 2016/08/23 12:28:26]

Spelling: "dictionary".

[jif, 2016/08/23 12:59:12]

Done.

+        base::MakeUnique<base::DictionaryValue>();
+    for (id key in wk_result) {
+      DCHECK([key respondsToSelector:@selector(UTF8String)]);
+      const std::string& path([key UTF8String]);
+      dictionnary->Set(path,
+                       ValueResultFromWKResult([wk_result objectForKey:key]));
+    }
+    result = std::move(dictionnary);
   } else {
     NOTREACHED();  // Convert other types as needed.
   }