DevTools: render continue to location as execution line instead of green dots.

Review-Url: https://codereview.chromium.org/2844603002
Cr-Commit-Position: refs/heads/master@{#467806}

third_party/WebKit/Source/devtools/front_end/text_editor/cmdevtools.css

@@ -28,16 +28,39 @@
     background-color: rgb(255, 255, 194);
 }
 
+.CodeMirror .source-frame-eval-expression-start {
+    border-left-width: 1px;
+    margin-left: -1px;
+}
+
 .CodeMirror .source-frame-eval-expression-end {
     border-right-width: 1px;
     margin-right: -1px;
 }
 
-.CodeMirror .source-frame-eval-expression-start {
+.CodeMirror .source-frame-continue-to-location {
+    outline: 0;
+    border: 1px solid transparent;
+    border-left-width: 0;
+    border-right-width: 0;
+    background-color: rgb(230, 236, 255);
+    cursor: pointer;
+}
+
+.CodeMirror .source-frame-continue-to-location:hover {
+    border: 1px solid rgb(121, 141, 254);
+    background-color: rgb(171, 191, 254);
+}
+.CodeMirror .source-frame-continue-to-location-start {
     border-left-width: 1px;
     margin-left: -1px;
 }
 
+.CodeMirror .source-frame-continue-to-location-end {
+    border-right-width: 1px;
+    margin-right: -1px;
+}
+
 .CodeMirror-readonly .CodeMirror-cursor {
     display: none;
 }

third_party/WebKit/Source/devtools/front_end/ui/Popover.js

@@ -34,7 +34,7 @@
 UI.PopoverHelper = class {
   /**
    * @param {!Element} container
-   * @param {function(!Event):?UI.PopoverRequest} getRequest
+   * @param {function(!MouseEvent):?UI.PopoverRequest} getRequest
    */
   constructor(container, getRequest) {
     this._disableOnClick = false;
@@ -93,7 +93,7 @@ UI.PopoverHelper = class {
 
     this._startHidePopoverTimer(0);
     this._stopShowPopoverTimer();
-    this._startShowPopoverTimer(event, 0);
+    this._startShowPopoverTimer(/** @type {!MouseEvent} */ (event), 0);
   }
 
   /**
@@ -108,7 +108,8 @@ UI.PopoverHelper = class {
     this._stopShowPopoverTimer();
     if (event.which && this._disableOnClick)
       return;
-    this._startShowPopoverTimer(event, this.isPopoverVisible() ? this._showTimeout * 0.6 : this._showTimeout);
+    this._startShowPopoverTimer(
+        /** @type {!MouseEvent} */ (event), this.isPopoverVisible() ? this._showTimeout * 0.6 : this._showTimeout);
   }
 
   /**
@@ -154,7 +155,7 @@ UI.PopoverHelper = class {
   }
 
   /**
-   * @param {!Event} event
+   * @param {!MouseEvent} event
    * @param {number} timeout
    */
   _startShowPopoverTimer(event, timeout) {