diff --git a/core/scrollbar.js b/core/scrollbar.js
index ba752a053..0046442f2 100644
--- a/core/scrollbar.js
+++ b/core/scrollbar.js
@@ -653,6 +653,24 @@ Blockly.Scrollbar.prototype.resize = function(opt_metrics) {
   this.updateMetrics_();
 };
 
+/**
+ * Returns whether the a resizeView is necessary by comparing the passed
+ * hostMetrics with cached old host metrics.
+ * @param {!Blockly.utils.Metrics} hostMetrics A data structure describing all
+ *     the required dimensions, possibly fetched from the host object.
+ * @return {boolean} Whether a resizeView is necesssary.
+ * @private
+ */
+Blockly.Scrollbar.prototype.requiresViewResize_ = function(hostMetrics) {
+  if (!this.oldHostMetrics_) {
+    return true;
+  }
+  return this.oldHostMetrics_.viewWidth !== hostMetrics.viewWidth ||
+      this.oldHostMetrics_.viewHeight !== hostMetrics.viewHeight ||
+      this.oldHostMetrics_.absoluteLeft !== hostMetrics.absoluteLeft ||
+      this.oldHostMetrics_.absoluteTop !== hostMetrics.absoluteTop;
+};
+
 /**
  * Recalculate a horizontal scrollbar's location and length.
  * @param {!Blockly.utils.Metrics} hostMetrics A data structure describing all
@@ -660,9 +678,11 @@ Blockly.Scrollbar.prototype.resize = function(opt_metrics) {
  * @private
  */
 Blockly.Scrollbar.prototype.resizeHorizontal_ = function(hostMetrics) {
-  // TODO: Inspect metrics to determine if we can get away with just a content
-  // resize.
-  this.resizeViewHorizontal(hostMetrics);
+  if (this.requiresViewResize_(hostMetrics)) {
+    this.resizeViewHorizontal(hostMetrics);
+  } else {
+    this.resizeContentHorizontal(hostMetrics);
+  }
 };
 
 /**
@@ -755,9 +775,11 @@ Blockly.Scrollbar.prototype.resizeContentHorizontal = function(hostMetrics) {
  * @private
  */
 Blockly.Scrollbar.prototype.resizeVertical_ = function(hostMetrics) {
-  // TODO: Inspect metrics to determine if we can get away with just a content
-  // resize.
-  this.resizeViewVertical(hostMetrics);
+  if (this.requiresViewResize_(hostMetrics)) {
+    this.resizeViewVertical(hostMetrics);
+  } else {
+    this.resizeContentVertical(hostMetrics);
+  }
 };
 
 /**