Enable CSP on more WebUI pages

content/public/browser/url_data_source.h

Index: content/public/browser/url_data_source.h
diff --git a/content/public/browser/url_data_source.h b/content/public/browser/url_data_source.h
index 565b0ff291a3f99866e271b4ed46028910622a19..43856110516630369928dabb5c0edf678473d9a3 100644
--- a/content/public/browser/url_data_source.h
+++ b/content/public/browser/url_data_source.h
@@ -86,7 +86,7 @@ class CONTENT_EXPORT URLDataSource {
   // Returns true if responses from this URLDataSource can be cached.
   virtual bool AllowCaching() const;
 
-  // If you are overriding this, then you have a bug.
+  // If you are overriding the following two methods, then you have a bug.
   // It is not acceptable to disable content-security-policy on chrome:// pages
   // to permit functionality excluded by CSP, such as inline script.
   // Instead, you must go back and change your WebUI page so that it is
@@ -94,6 +94,11 @@ class CONTENT_EXPORT URLDataSource {
   // is delivered through the data manager backend. Talk to tsepez for more

[Tom Sepez, 2016/05/25 19:20:56]

change: /Talk to tsepez for more info./Do not disable CSP on your page without
first contacting the chrome security team./

[wychen, 2016/05/25 22:49:41]

Done.

   // info.
   virtual bool ShouldAddContentSecurityPolicy() const;
+  // If you have to allow more permissions, enabling CSP with relaxed script-src

[Tom Sepez, 2016/05/25 19:20:56]

I'd like to wordsmith this comment.

// For pre-exsiting code, enabling CSP with relaxed script-src attributes
// may be marginally better than disabling CSP outright.
// Do not override this method without first contacting the chrome 
// security team.
// By default ...

[wychen, 2016/05/25 22:49:41]

Done.

+  // by overriding the following method is better than disabling CSP outright.
+  // By default, "script-src chrome://resources 'self' 'unsafe-eval';" is added
+  // to CSP. Override to change this.
+  virtual std::string GetContentSecurityPolicyScriptSrc() const;
 
   // It is OK to override the following two methods to a custom CSP directive
   // thereby slightly reducing the protection applied to the page.