DevTools: DOMStorage action history must be reset once page/script modifies the DOM storage

LayoutTests/inspector/storage-panel-dom-storage-undo-redo-expected.txt

 This test checks the undo/redo operations are performed correctly on the DOM storage views
 
 
 Running: initialize
 Initialized localStorage and sessionStorage by clearing entries.
 
 Running: undoLocalStorageWithEmptyStack
 LocalStorage contents:[]
 
 Running: redoLocalStorageWithEmptyStack
 LocalStorage contents:[]
 
 Running: localStorageUndoInterlacedWithAddition
+LocalStorage contents:[a1=b1,a2=b2]
 LocalStorage contents:[a1=b1]
 LocalStorage contents:[a1=b1,a3=b3]
 LocalStorage contents:[a1=b1]
 
 Running: addLocalStorageEntries
 LocalStorage contents:[a1=b1,a2=b2]
 
 Running: undoLocalStorageLastAddition
 LocalStorage contents:[a1=b1]
 
@@ skipping 38 matching lines @@
 Running: undoSessionStorageKeyModifications
 SessionStorage contents:[p1=q1,p2=q2,p3=q3,p4=q4]
 
 Running: validateMaxUndoRedoStackDepth
 Undo/redo stack depth limit is 20
 Performing 40 actions
 LocalStorage contents:[a1=b1,a2=b2,x10=y10,x11=y11,x12=y12,x13=y13,x14=y14,x15=y15,x16=y16,x17=y17,x18=y18,x19=y19,x1=y1,x20=y20,x2=y2,x3=y3,x4=y4,x5=y5,x6=y6,x7=y7,x8=y8,x9=y9]
 Performing undo operation three times the depth i.e. 60 times but only last 20 operations are undone
 LocalStorage contents:[a1=b1,a2=b2,x10=y10,x1=y1,x2=y2,x3=y3,x4=y4,x5=y5,x6=y6,x7=y7,x8=y8,x9=y9]
 
+Running: resetDOMStorageHistoryUponPageModification
+Adding u1=v1 and u2=v2 in the localStorage
+LocalStorage contents:[a1=b1,a2=b2,u1=v1,u2=v2,x10=y10,x1=y1,x2=y2,x3=y3,x4=y4,x5=y5,x6=y6,x7=y7,x8=y8,x9=y9]
+
+Performing undo for removing u2=v2
+LocalStorage contents:[a1=b1,a2=b2,u1=v1,x10=y10,x1=y1,x2=y2,x3=y3,x4=y4,x5=y5,x6=y6,x7=y7,x8=y8,x9=y9]
+
+Page has modified the storage by adding u3=v3
+
+Undo wont work anymore as page modification has cleared the history.
+LocalStorage contents:[a1=b1,a2=b2,u1=v1,u3=v3,x10=y10,x1=y1,x2=y2,x3=y3,x4=y4,x5=y5,x6=y6,x7=y7,x8=y8,x9=y9]
+
+Redo wont work anymore as page modification has cleared the history.
+LocalStorage contents:[a1=b1,a2=b2,u1=v1,u3=v3,x10=y10,x1=y1,x2=y2,x3=y3,x4=y4,x5=y5,x6=y6,x7=y7,x8=y8,x9=y9]
+
 Running: clearDOMStorageAndFinish
 Finished DOMStorage undo/redo tests and cleared localStorage and sessionStorage entries.