Bug 1845174 - Don't use variation fonts on Android API versions <= 23. r=gfx-reviewers,lsalzman

Differential Revision: https://phabricator.services.mozilla.com/D186242

gfx/thebes/gfxAndroidPlatform.cpp

@@ -287,6 +287,13 @@ bool gfxAndroidPlatform::RequiresLinearZoom() {
   return gfxPlatform::RequiresLinearZoom();
 }
 
+bool gfxAndroidPlatform::CheckVariationFontSupport() {
+  // Don't attempt to use variations on Android API versions up to Marshmallow,
+  // because the system freetype version is too old and the parent process may
+  // access it during printing (bug 1845174).
+  return jni::GetAPIVersion() > 23;
+}
+
 class AndroidVsyncSource final : public VsyncSource,
                                  public widget::AndroidVsync::Observer {
  public:

gfx/thebes/gfxAndroidPlatform.h

@@ -40,11 +40,7 @@ class gfxAndroidPlatform final : public gfxPlatform {
   already_AddRefed<mozilla::gfx::VsyncSource> CreateGlobalHardwareVsyncSource()
       override;
 
-  static bool CheckVariationFontSupport() {
-    // We build with in-tree FreeType, so we know it is a new enough
-    // version to support variations.
-    return true;
-  }
+  static bool CheckVariationFontSupport();
 
  protected:
   void InitAcceleration() override;