Proof of concept implementation of context based history filtering.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 59791b51e94f69bfbe162b375242ea576cb65ebc..f792db7257ddde432652b9c32b7174781ecb4d69 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -2048,6 +2048,18 @@ void WebContentsImpl::Cut() {
   RecordAction(base::UserMetricsAction("Cut"));
 }
 
+void WebContentsImpl::Print() {
+  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
+                    SetHistoryContext(controller_.GetLastCommittedEntry(), 3));
+  printf("\nPrint\n");
+}
+
+void WebContentsImpl::SaveImage() {
+  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
+                    SetHistoryContext(controller_.GetLastCommittedEntry(), 2));
+  printf("\nSave Image\n");
+}
+
 void WebContentsImpl::Copy() {
   RenderFrameHost* focused_frame = GetFocusedFrame();
   if (!focused_frame)
@@ -2055,6 +2067,9 @@ void WebContentsImpl::Copy() {
 
   focused_frame->Send(new InputMsg_Copy(focused_frame->GetRoutingID()));
   RecordAction(base::UserMetricsAction("Copy"));
+  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
+                    SetHistoryContext(controller_.GetLastCommittedEntry(), 1));
+  printf("\nCopy\n");
 }
 
 void WebContentsImpl::CopyToFindPboard() {
@@ -3147,6 +3162,9 @@ void WebContentsImpl::OnMediaPlayingNotification(int64 player_cookie,
   }
 
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, MediaStartedPlaying());
+  printf("\nPlaying media\n");
+  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
+                    SetHistoryContext(controller_.GetLastCommittedEntry(), 4));
 }
 
 void WebContentsImpl::OnMediaPausedNotification(int64 player_cookie) {