Revert of CSS Motion Path: delete implementation of motion-offset property

third_party/WebKit/Source/core/frame/Deprecation.cpp

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
index a2fdb48282e6db259159bf6b3fdbb172f765fa01..3fbc1223ee9db8d78e6f6db7e8b196dae7d12190 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -15,6 +15,7 @@
 namespace {
 
 enum Milestone {
+  M58,
   M59,
   M60,
   M61,
@@ -26,6 +27,8 @@
   // https://www.chromium.org/developers/calendar
 
   switch (milestone) {
+    case M58:
+      return "M58, around April 2017";
     case M59:
       return "M59, around June 2017";
     case M60:
@@ -114,10 +117,13 @@
 }
 
 String Deprecation::DeprecationMessage(CSSPropertyID unresolved_property) {
-  // TODO: Add a switch here when there are properties that we intend to
-  // deprecate.
-  // Returning an empty string for now.
-  return g_empty_string;
+  switch (unresolved_property) {
+    case CSSPropertyAliasMotionOffset:
+      return replacedWillBeRemoved("motion-offset", "offset-distance", M58,
+                                   "6390764217040896");
+    default:
+      return g_empty_string;
+  }
 }
 
 void Deprecation::CountDeprecation(const LocalFrame* frame,