Implement <webview>.addContentScript/removeContentScript API [1].

This patch includes the changes that enables <webview>.addContentScript/removeContentScript API  work on extensions.

This is the first patch in a series of patches:
1) Implement <webview>.addContentScript/removeContentScript API [1] (https://codereview.chromium.org/959413003)
2) Implement <webview>.addContentScript/removeContentScript API [2] (https://codereview.chromium.org/1056533002)
3) Implement <webview>.addContentScript/removeContentScript API [3] (https://codereview.chromium.org/1058113002)

TBR=asvitkine@chromium.org
BUG=461052

Review URL: https://codereview.chromium.org/959413003

Cr-Commit-Position: refs/heads/master@{#325492}

1 files changed, 10 insertions, 0 deletions

diff --git a/extensions/browser/declarative_user_script_master.cc b/extensions/browser/declarative_user_script_master.cc
index f16157f..130e9ba 100644
--- a/extensions/browser/declarative_user_script_master.cc
+++ b/extensions/browser/declarative_user_script_master.cc
@@ -28,12 +28,22 @@ void DeclarativeUserScriptMaster::AddScript(const UserScript& script) {
   loader_.AddScripts(set);
 }
 
+void DeclarativeUserScriptMaster::AddScripts(
+    const std::set<UserScript>& scripts) {
+  loader_.AddScripts(scripts);
+}
+
 void DeclarativeUserScriptMaster::RemoveScript(const UserScript& script) {
   std::set<UserScript> set;
   set.insert(script);
   loader_.RemoveScripts(set);
 }
 
+void DeclarativeUserScriptMaster::RemoveScripts(
+    const std::set<UserScript>& scripts) {
+  loader_.RemoveScripts(scripts);
+}
+
 void DeclarativeUserScriptMaster::ClearScripts() {
   loader_.ClearScripts();
 }