Implementation of subresource integrity attribute for secure origins.

Source/core/dom/ScriptLoader.cpp

Index: Source/core/dom/ScriptLoader.cpp
diff --git a/Source/core/dom/ScriptLoader.cpp b/Source/core/dom/ScriptLoader.cpp
index f69e0e63d362e4750b5f16bbce060813de6b7058..9805ea52efdfb846f729ddfe9c7687d1b834b5f3 100644
--- a/Source/core/dom/ScriptLoader.cpp
+++ b/Source/core/dom/ScriptLoader.cpp
@@ -42,6 +42,7 @@
 #include "core/html/imports/HTMLImport.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/SubresourceIntegrity.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/svg/SVGScriptElement.h"
@@ -318,6 +319,10 @@ void ScriptLoader::executeScript(const ScriptSourceCode& sourceCode)
             contextDocument->addConsoleMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Refused to execute script from '" + resource->url().elidedString() + "' because its MIME type ('" + resource->mimeType() + "') is not executable, and strict MIME type checking is enabled."));
             return;
         }
+
+        // TODO(jww): On failure, SRI should probably provide an error message for the console.

[Mike West, 2014/09/16 06:45:03]

nit: Blink style is '// FIXME:'. Rather than tagging your name to the comment,
consider adding a crbug link.

[jww, 2014/09/16 22:34:49]

Done.

+        if (!SubresourceIntegrity::CheckSubresourceIntegrity(*m_element, sourceCode.source(), sourceCode.resource()->url()))

[Mike West, 2014/09/16 06:45:03]

Perhaps this could be simplified by just passing in |sourceCode|?

[jww, 2014/09/16 22:34:49]

My thought is that we're going to do this for Style soon, and that has just a
straight String for the source, so I'd like to keep this general for that as
well.

+            return;
     }
 
     // FIXME: Can this be moved earlier in the function?