Add support for providing an external file for extracting content.

components/dom_distiller/core/distiller_page.cc

Index: components/dom_distiller/core/distiller_page.cc
diff --git a/components/dom_distiller/core/distiller_page.cc b/components/dom_distiller/core/distiller_page.cc
index 1e70b83a2a51906811a7b6a879bd5a3ffb51644f..759b7851ce6b9bd0a470d8f4ccf97eb3e9056dae 100644
--- a/components/dom_distiller/core/distiller_page.cc
+++ b/components/dom_distiller/core/distiller_page.cc
@@ -25,10 +25,8 @@ namespace {
 const char* kOptionsPlaceholder = "$$OPTIONS";
 
 std::string GetDistillerScriptWithOptions(
+    const std::string& script,
     const dom_distiller::proto::DomDistillerOptions& options) {
-  std::string script = ResourceBundle::GetSharedInstance()
-                           .GetRawDataResource(IDR_DISTILLER_JS)
-                           .as_string();
   if (script.empty()) {
     return "";
   }
@@ -43,16 +41,20 @@ std::string GetDistillerScriptWithOptions(
   DCHECK_NE(std::string::npos, options_offset);
   DCHECK_EQ(std::string::npos,
             script.find(kOptionsPlaceholder, options_offset + 1));
-  script =
-      script.replace(options_offset, strlen(kOptionsPlaceholder), options_json);
-  return script;
+  // Make a copy of |script| so the options can be applied.
+  std::string script_with_options = script;
+  script_with_options = script_with_options.replace(
+      options_offset, strlen(kOptionsPlaceholder), options_json);
+  return script_with_options;
 }
 
 }
 
 DistillerPageFactory::~DistillerPageFactory() {}
 
-DistillerPage::DistillerPage() : ready_(true) {}
+DistillerPage::DistillerPage(const std::string& distiller_js_script)
+    : ready_(true), distiller_js_script_(distiller_js_script) {
+}
 
 DistillerPage::~DistillerPage() {}
 
@@ -65,7 +67,8 @@ void DistillerPage::DistillPage(
   // the callback to OnDistillationDone happens.
   ready_ = false;
   distiller_page_callback_ = callback;
-  DistillPageImpl(gurl, GetDistillerScriptWithOptions(options));
+  DistillPageImpl(gurl,
+                  GetDistillerScriptWithOptions(distiller_js_script_, options));
 }
 
 void DistillerPage::OnDistillationDone(const GURL& page_url,