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

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

Index: LayoutTests/inspector/storage-panel-dom-storage-undo-redo-expected.txt
diff --git a/LayoutTests/inspector/storage-panel-dom-storage-undo-redo-expected.txt b/LayoutTests/inspector/storage-panel-dom-storage-undo-redo-expected.txt
index 86a0690daae60411355ed10284a11ad5c3736592..0de3e0d71133deb8da644cb2a9242a34cee87506 100644
--- a/LayoutTests/inspector/storage-panel-dom-storage-undo-redo-expected.txt
+++ b/LayoutTests/inspector/storage-panel-dom-storage-undo-redo-expected.txt
@@ -11,6 +11,7 @@ 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]
@@ -69,6 +70,21 @@ LocalStorage contents:[a1=b1,a2=b2,x10=y10,x11=y11,x12=y12,x13=y13,x14=y14,x15=y
 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.