DevTools: use per-LocalFrame instrumenting agents instead of per-Page ones.

Source/core/inspector/InspectorCanvasAgent.cpp

Index: Source/core/inspector/InspectorCanvasAgent.cpp
diff --git a/Source/core/inspector/InspectorCanvasAgent.cpp b/Source/core/inspector/InspectorCanvasAgent.cpp
index 7b34b4ae1352227cf32ec84e4e159ed7e57eb6a2..21222fffb5df643468459cbd12033498e829a5e5 100644
--- a/Source/core/inspector/InspectorCanvasAgent.cpp
+++ b/Source/core/inspector/InspectorCanvasAgent.cpp
@@ -268,8 +268,8 @@ void InspectorCanvasAgent::findFramesWithUninstrumentedCanvases()
 {
     class NodeVisitor final : public WrappedNodeVisitor {
     public:
-        NodeVisitor(Page* page, FramesWithUninstrumentedCanvases& result)
-            : m_page(page)
+        NodeVisitor(LocalFrame* frame, FramesWithUninstrumentedCanvases& result)
+            : m_frame(frame)
             , m_framesWithUninstrumentedCanvases(result)
         {
         }
@@ -281,7 +281,7 @@ void InspectorCanvasAgent::findFramesWithUninstrumentedCanvases()
                 return;
 
             LocalFrame* frame = node->document().frame();
-            if (frame->page() != m_page)
+            if (frame->localFrameRoot() != m_frame)
                 return;
 
             if (toHTMLCanvasElement(node)->renderingContext())
@@ -289,9 +289,9 @@ void InspectorCanvasAgent::findFramesWithUninstrumentedCanvases()
         }
 
     private:
-        Page* m_page;
+        LocalFrame* m_frame;
         FramesWithUninstrumentedCanvases& m_framesWithUninstrumentedCanvases;
-    } nodeVisitor(m_pageAgent->page(), m_framesWithUninstrumentedCanvases);
+    } nodeVisitor(m_pageAgent->mainFrame(), m_framesWithUninstrumentedCanvases);
 
     m_framesWithUninstrumentedCanvases.clear();
     ScriptProfiler::visitNodeWrappers(&nodeVisitor);