[WIP][SVG 2/4] Make data URL handling in ResourceFetcher and WebURLLoaderImpl consistent

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index 6474a7f8741570ee5ae6e789be4967cf5af72759..042a5dc9d6d6f65e9eda60be695065a8795aba85 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -432,17 +432,25 @@ WebString BlinkPlatformImpl::userAgent() {
   return user_agent;
 }
 
-WebData BlinkPlatformImpl::parseDataURL(const WebURL& url,
-                                        WebString& mimetype_out,
-                                        WebString& charset_out) {
+bool BlinkPlatformImpl::parseDataURLIfCanBeHandledLocally(
+    const blink::WebURLRequest& request,
+    WebString& mimetype_out,
+    WebString& charset_out,
+    WebData& data_out) {
+  // |resource_dispatcher_exists| is a workaround for RenderViewImplTest
+  // (https://crbug.com/187500). We set it to |true| when used from Blink.
+  if (!WebURLLoaderImpl::CanHandleDataURLRequestLocally(request, true))
+    return false;
+
   std::string mime_type, char_set, data;
-  if (net::DataURL::Parse(url, &mime_type, &char_set, &data) &&
-      mime_util::IsSupportedMimeType(mime_type)) {
+  if (net::DataURL::Parse(request.url(), &mime_type, &char_set, &data)) {
     mimetype_out = WebString::fromUTF8(mime_type);
     charset_out = WebString::fromUTF8(char_set);
-    return data;
+    data_out = data;
+  } else {
+    data_out = WebData();
   }
-  return WebData();
+  return true;
 }
 
 WebURLError BlinkPlatformImpl::cancelledError(