Bug 1171972 - Don't expect scrollbar buttons on GTK themes. r=karlt

layout/base/tests/mochitest.ini

@@ -260,6 +260,6 @@ support-files = bug1080361_inner.html
 [test_bug1093686.html]
 support-files = bug1093686_inner.html
 [test_bug1120705.html]
-skip-if = buildapp == 'android' || buildapp == 'b2g' || buildapp == 'b2g-debug' || os == 'mac' # android and b2g do not have clickable scrollbars, mac does not have scrollbar down and up buttons
+skip-if = buildapp == 'android' || buildapp == 'b2g' || buildapp == 'b2g-debug' || os == 'mac' || toolkit == 'gtk2' || toolkit == 'gtk3' # android and b2g do not have clickable scrollbars, mac does not have scrollbar down and up buttons, gtk may or may not have scrollbar buttons depending on theme
 [test_bug1153130.html]
 support-files = bug1153130_inner.html

layout/base/tests/test_scroll_snapping_scrollbars.html

@@ -136,7 +136,7 @@ var testCases = [
     "mouseOffset"   : { "x" : 0, "y" : 0 },
     "duration"      : "0",
     "runMac"        : false, // OSX does not have have line-scroll buttons
-    "runGtk"        : true,
+    "runGtk"        : false, // Some GTK themes may not have scroll buttons
     "runWin"        : true
   },
   {
@@ -148,7 +148,7 @@ var testCases = [
     "mouseOffset"   : { "x" : 0, "y" : 0 },
     "duration"      : "500",
     "runMac"        : false, // OSX does not have have line-scroll buttons
-    "runGtk"        : true,
+    "runGtk"        : false, // Some GTK themes may not have scroll buttons
     "runWin"        : true
   },
   {
@@ -160,7 +160,7 @@ var testCases = [
     "mouseOffset"   : { "x" : 0, "y" : 0 },
     "duration"      : "0",
     "runMac"        : false, // OSX does not have have line-scroll buttons
-    "runGtk"        : true,
+    "runGtk"        : false, // Some GTK themes may not have scroll buttons
     "runWin"        : true
   },
   {
@@ -172,7 +172,7 @@ var testCases = [
     "mouseOffset"   : { "x" : 0, "y" : 0 },
     "duration"      : "500",
     "runMac"        : false, // OSX does not have have line-scroll buttons
-    "runGtk"        : true,
+    "runGtk"        : false, // Some GTK themes may not have scroll buttons
     "runWin"        : true
   },
   {
@@ -184,7 +184,7 @@ var testCases = [
     "mouseOffset"   : { "x" : 0, "y" : 0 },
     "duration"      : "0",
     "runMac"        : false, // OSX does not have have line-scroll buttons
-    "runGtk"        : true,
+    "runGtk"        : false, // Some GTK themes may not have scroll buttons
     "runWin"        : true
   },
   {
@@ -196,7 +196,7 @@ var testCases = [
     "mouseOffset"   : { "x" : 0, "y" : 0 },
     "duration"      : "500",
     "runMac"        : false, // OSX does not have have line-scroll buttons
-    "runGtk"        : true,
+    "runGtk"        : false, // Some GTK themes may not have scroll buttons
     "runWin"        : true
   },
   {
@@ -208,7 +208,7 @@ var testCases = [
     "mouseOffset"   : { "x" : 0, "y" : 0 },
     "duration"      : "0",
     "runMac"        : false, // OSX does not have have line-scroll buttons
-    "runGtk"        : true,
+    "runGtk"        : false, // Some GTK themes may not have scroll buttons
     "runWin"        : true
   },
   {
@@ -220,7 +220,7 @@ var testCases = [
     "mouseOffset"   : { "x" : 0, "y" : 0 },
     "duration"      : "500",
     "runMac"        : false, // OSX does not have have line-scroll buttons
-    "runGtk"        : true,
+    "runGtk"        : false, // Some GTK themes may not have scroll buttons
     "runWin"        : true
   },