Backed out 7 changesets (bug 1452542) for failing toolkit/content/tests/chrome/test_arrowpanel.xul on a CLOSED TREE

Backed out changeset f206acff283f (bug 1452542)
Backed out changeset be97e652391f (bug 1452542)
Backed out changeset 4d3a028edaed (bug 1452542)
Backed out changeset 5619bba37cdd (bug 1452542)
Backed out changeset e83a797bdc61 (bug 1452542)
Backed out changeset 255e2feff19f (bug 1452542)
Backed out changeset fac55b1a0706 (bug 1452542)

Author: AndreeaPavel

config/recurse.mk

@@ -171,9 +171,6 @@ widget/android/bindings/export: build/annotationProcessors/export
 # .xpt generation needs the xpidl lex/yacc files
 xpcom/xpidl/export: xpcom/idl-parser/xpidl/export
 
-# CSS2Properties.webidl needs ServoCSSPropList.py from layout/style
-dom/bindings/export: layout/style/export
-
 ifdef ENABLE_CLANG_PLUGIN
 $(filter-out config/host build/unix/stdc++compat/% build/clang-plugin/%,$(compile_targets)): build/clang-plugin/target build/clang-plugin/tests/target
 build/clang-plugin/tests/target: build/clang-plugin/target

devtools/shared/css/generated/mach_commands.py

@@ -50,17 +50,32 @@ def generate_css_db(self):
 
     def get_preferences(self):
         """Get all of the preferences associated with enabling and disabling a property."""
-        # The data takes the following form:
+        # Build the command to run the preprocessor on PythonCSSProps.h
+        headerPath = resolve_path(self.topsrcdir, 'layout/style/PythonCSSProps.h')
+
+        cpp = self.substs['CPP']
+
+        if not cpp:
+            print("Unable to find the cpp program. Please do a full, nonartifact")
+            print("build and try this again.")
+            sys.exit(1)
+
+        if type(cpp) is list:
+            cmd = cpp
+        else:
+            cmd = shellutil.split(cpp)
+        cmd += shellutil.split(self.substs['ACDEFINES'])
+        cmd.append(headerPath)
+
+        # The preprocessed list takes the following form:
         # [ (name, prop, id, flags, pref, proptype), ... ]
-        dataPath = resolve_path(self.topobjdir, 'layout/style/ServoCSSPropList.py')
-        with open(dataPath, "r") as f:
-            data = eval(f.read())
+        preprocessed = eval(subprocess.check_output(cmd))
 
         # Map this list
         # (name, prop, id, flags, pref, proptype) => (name, pref)
         preferences = [
             (name, pref)
-            for name, prop, id, flags, pref, proptype in data
+            for name, prop, id, flags, pref, proptype in preprocessed
             if 'CSS_PROPERTY_INTERNAL' not in flags and pref]
 
         return preferences