Update Polymer components.

third_party/polymer/components/paper-tooltip/paper-tooltip.html

Index: third_party/polymer/components/paper-tooltip/paper-tooltip.html
diff --git a/third_party/polymer/components/paper-tooltip/paper-tooltip.html b/third_party/polymer/components/paper-tooltip/paper-tooltip.html
index 4c2f0391b62ee50f428aabdf0dfd070ab9f67656..670280b17985f5cc2b0b490b15663ebb1f5ce4cc 100644
--- a/third_party/polymer/components/paper-tooltip/paper-tooltip.html
+++ b/third_party/polymer/components/paper-tooltip/paper-tooltip.html
@@ -244,8 +244,20 @@ Custom property | Description | Default
         if (this._showing)
           return;
 
-        if (Polymer.dom(this).textContent.trim() === '')
-          return;
+        if (Polymer.dom(this).textContent.trim() === ''){
+          // Check if effective children are also empty
+          var allChildrenEmpty = true;
+          var effectiveChildren = Polymer.dom(this).getEffectiveChildNodes();
+          for (var i = 0; i < effectiveChildren.length; i++) {
+            if (effectiveChildren[i].textContent.trim() !== '') {
+              allChildrenEmpty = false;
+              break;
+            }
+          }
+          if (allChildrenEmpty) {
+            return;
+          }
+        }
 
 
         this.cancelAnimation();
@@ -321,8 +333,8 @@ Custom property | Description | Default
 
         // TODO(noms): This should use IronFitBehavior if possible.
         if (this.fitToVisibleBounds) {
-          // Clip the left/right side.
-          if (tooltipLeft + thisRect.width > window.innerWidth) {
+          // Clip the left/right side
+          if (parentRect.left + tooltipLeft + thisRect.width > window.innerWidth) {
             this.style.right = '0px';
             this.style.left = 'auto';
           } else {
@@ -331,11 +343,11 @@ Custom property | Description | Default
           }
 
           // Clip the top/bottom side.
-          if (tooltipTop + thisRect.height > window.innerHeight) {
-            this.style.bottom = '0px';
+          if (parentRect.top + tooltipTop + thisRect.height > window.innerHeight) {
+            this.style.bottom = parentRect.height + 'px';
             this.style.top = 'auto';
           } else {
-            this.style.top = Math.max(0, tooltipTop) + 'px';
+            this.style.top = Math.max(-parentRect.top, tooltipTop) + 'px';
             this.style.bottom = 'auto';
           }
         } else {