MAGETWO-89051: Absorb image optimization from 2.1 into 2.3

Author: duhon

app/design/frontend/Magento/blank/etc/view.xml

@@ -81,6 +81,15 @@
                 <width>90</width>
                 <height>90</height>
             </image>
+            <image id="product_swatch_image_large" type="image"/>
+            <image id="product_swatch_image_medium" type="image">
+                <width>240</width>
+                <height>300</height>
+            </image>
+            <image id="product_swatch_image_small" type="thumbnail">
+                <width>88</width>
+                <height>110</height>
+            </image>
             <image id="product_page_main_image" type="image">
                 <width>700</width>
                 <height>700</height>

app/design/frontend/Magento/rush/etc/view.xml

@@ -90,6 +90,15 @@
                 <width>700</width>
                 <height>700</height>
             </image>
+            <image id="product_swatch_image_large" type="image"/>
+            <image id="product_swatch_image_medium" type="image">
+                <width>240</width>
+                <height>300</height>
+            </image>
+            <image id="product_swatch_image_small" type="thumbnail">
+                <width>88</width>
+                <height>110</height>
+            </image>
             <image id="product_page_more_views" type="thumbnail">
                 <width>90</width>
                 <height>90</height>