Skip scalefactor150 tests that are failing on debug build.

BUG=593567
R=wkorman@chromium.org

Review URL: https://codereview.chromium.org/1813603002

Cr-Commit-Position: refs/heads/master@{#381641}

third_party/WebKit/LayoutTests/TestExpectations

@@ -273,6 +273,11 @@ crbug.com/542541 [ Debug ] virtual/pointerevent/fast/events/click-count.html [ P
 # TODO(oshima): Mac Android are currently not supported.
 crbug.com/567837 [ Mac Android ] virtual/scalefactor200withzoom/fast/hidpi/static [ Skip ]
 
+# TODO(oshima): Debug build generates slightly different image for these tests.
+crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/calendar-picker-appearance.html [ Skip ]
+crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/data-suggestion-picker-appearance.html [ Skip ]
+crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/popup-menu-appearance.html [ Skip ]
+
 # TODO(oshima): Move the event scaling code to eventSender and remove this.
 crbug.com/567837 virtual/scalefactor200/fast/hidpi/static/mousewheel-scroll-amount.html [ Skip ]
 crbug.com/567837 virtual/scalefactor200/fast/hidpi/static/gesture-scroll-amount.html [ Skip ]