Bug 1019124 - Use HDPI assets for Canvas Debugger. r=bgrins,vporof

browser/themes/shared/devtools/canvasdebugger.inc.css

@@ -153,6 +153,11 @@
 
 /* Debugging pane controls */
 
+#debugging-controls .devtools-toolbarbutton > .toolbarbutton-icon {
+  width: 16px;
+  height: 16px;
+}
+
 #resume {
   list-style-image: url(debugger-play.png);
   -moz-image-region: rect(0px,32px,16px,16px);
@@ -170,6 +175,25 @@
   list-style-image: url(debugger-step-out.png);
 }
 
+@media (min-resolution: 2dppx) {
+  #resume {
+    list-style-image: url(debugger-play@2x.png);
+    -moz-image-region: rect(0px,64px,32px,32px);
+  }
+
+  #step-over {
+    list-style-image: url(debugger-step-over@2x.png);
+  }
+
+  #step-in {
+    list-style-image: url(debugger-step-in@2x.png);
+  }
+
+  #step-out {
+    list-style-image: url(debugger-step-out@2x.png);
+  }
+}
+
 #debugging-controls > toolbarbutton {
   transition: opacity 0.15s ease-in-out;
 }
@@ -256,6 +280,12 @@
   background-size: 12px;
 }
 
+@media (min-resolution: 2dppx) {
+  .selected .call-item-gutter {
+    background-image: url("editor-debug-location@2x.png");
+  }
+}
+
 .theme-dark .call-item-gutter {
   background-color: #181d20;
   color: #5f7387;