Allow building against system-wide harfbuzz.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=847568
---
 config/system-headers.mozbuild  | 7 +++++++
 dom/base/moz.build              | 3 +++
 gfx/moz.build                   | 4 +++-
 gfx/skia/generate_mozbuild.py   | 3 +++
 gfx/skia/moz.build              | 3 +++
 gfx/thebes/moz.build            | 3 +++
 intl/unicharutil/util/moz.build | 3 +++
 netwerk/dns/moz.build           | 3 +++
 toolkit/library/moz.build       | 3 +++
 toolkit/moz.configure           | 9 +++++++++
 10 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/config/system-headers.mozbuild b/config/system-headers.mozbuild
index aa17660..7f416f9 100644
--- a/config/system-headers.mozbuild
+++ b/config/system-headers.mozbuild
@@ -1253,6 +1253,13 @@ if CONFIG["OS_TARGET"] == "Android":
         "vr/gvr/capi/include/gvr.h",
     ]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    system_headers += [
+	"harfbuzz/hb-glib.h",
+	"harfbuzz/hb-ot.h",
+	"harfbuzz/hb.h",
+    ]
+
 if CONFIG["MOZ_JACK"]:
     system_headers += [
         "jack/jack.h",
diff --git a/dom/base/moz.build b/dom/base/moz.build
index fb7ed4b..ea65621 100644
--- a/dom/base/moz.build
+++ b/dom/base/moz.build
@@ -616,6 +616,9 @@ FINAL_LIBRARY = "xul"
 if CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
     CXXFLAGS += CONFIG["MOZ_GTK3_CFLAGS"]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 GeneratedFile(
     "UseCounterList.h",
     script="gen-usecounters.py",
diff --git a/gfx/moz.build b/gfx/moz.build
index 56ea317..6cc19f8 100644
--- a/gfx/moz.build
+++ b/gfx/moz.build
@@ -10,6 +10,9 @@ with Files("**"):
 with Files("wr/**"):
     BUG_COMPONENT = ("Core", "Graphics: WebRender")
 
+if not CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    DIRS += ["harfbuzz/src"]
+
 DIRS += [
     "cairo",
     "2d",
@@ -20,7 +23,6 @@ DIRS += [
     "gl",
     "layers",
     "graphite2/src",
-    "harfbuzz/src",
     "ots/src",
     "thebes",
     "ipc",
diff --git a/gfx/skia/generate_mozbuild.py b/gfx/skia/generate_mozbuild.py
index b589efd..47f49e1 100755
--- a/gfx/skia/generate_mozbuild.py
+++ b/gfx/skia/generate_mozbuild.py
@@ -95,6 +95,9 @@ if CONFIG['CC_TYPE'] in ('clang', 'clang-cl'):
         '-Wno-unused-private-field',
     ]
 
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    CXXFLAGS += CONFIG['MOZ_HARFBUZZ_CFLAGS']
+
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk', 'android'):
     LOCAL_INCLUDES += [
         "/gfx/cairo/cairo/src",
diff --git a/gfx/skia/moz.build b/gfx/skia/moz.build
index 7fee545..ba1a403 100644
--- a/gfx/skia/moz.build
+++ b/gfx/skia/moz.build
@@ -623,6 +623,9 @@ if CONFIG['CC_TYPE'] in ('clang', 'clang-cl'):
         '-Wno-unused-private-field',
     ]
 
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    CXXFLAGS += CONFIG['MOZ_HARFBUZZ_CFLAGS']
+
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk', 'android'):
     LOCAL_INCLUDES += [
         "/gfx/cairo/cairo/src",
diff --git a/gfx/thebes/moz.build b/gfx/thebes/moz.build
index 48f2849..5e16334 100644
--- a/gfx/thebes/moz.build
+++ b/gfx/thebes/moz.build
@@ -297,6 +297,9 @@ LOCAL_INCLUDES += CONFIG["SKIA_INCLUDES"]
 
 DEFINES["GRAPHITE2_STATIC"] = True
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 CXXFLAGS += ["-Werror=switch"]
 
 include("/tools/fuzzing/libfuzzer-config.mozbuild")
diff --git a/intl/unicharutil/util/moz.build b/intl/unicharutil/util/moz.build
index 2396210..092baac 100644
--- a/intl/unicharutil/util/moz.build
+++ b/intl/unicharutil/util/moz.build
@@ -24,6 +24,9 @@ UNIFIED_SOURCES += [
     "nsUnicodeProperties.cpp",
 ]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 include("/ipc/chromium/chromium-config.mozbuild")
 
 GeneratedFile(
diff --git a/netwerk/dns/moz.build b/netwerk/dns/moz.build
index c926d14..5082238 100644
--- a/netwerk/dns/moz.build
+++ b/netwerk/dns/moz.build
@@ -119,4 +119,7 @@ LOCAL_INCLUDES += [
     "/netwerk/protocol/http",
 ]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 USE_LIBS += ["icu"]
diff --git a/toolkit/library/moz.build b/toolkit/library/moz.build
index a9feb0b..1d13418 100644
--- a/toolkit/library/moz.build
+++ b/toolkit/library/moz.build
@@ -288,6 +288,9 @@ if CONFIG["MOZ_ANDROID_GOOGLE_VR"]:
         "-lgvr",
     ]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    OS_LIBS += CONFIG["MOZ_HARFBUZZ_LIBS"]
+
 if CONFIG["MOZ_SYSTEM_JPEG"]:
     OS_LIBS += CONFIG["MOZ_JPEG_LIBS"]
 
diff --git a/toolkit/moz.configure b/toolkit/moz.configure
index c5dcc65..0c9e5fe 100644
--- a/toolkit/moz.configure
+++ b/toolkit/moz.configure
@@ -718,6 +718,22 @@ def freetype2_combined_info(fontconfig_info, freetype2_info):
 set_define("MOZ_HAVE_FREETYPE2", depends_if(freetype2_info)(lambda _: True))
 
 
+# HarfBuzz
+# ==============================================================
+option(
+    "--with-system-harfbuzz",
+    help="Use system harfbuzz (located with pkgconfig)",
+    when=use_pkg_config,
+)
+@depends("--with-system-harfbuzz", when=use_pkg_config)
+def enable_system_harfbuzz_option(enable_system_harfbuzz):
+        return enable_system_harfbuzz
+
+system_harfbuzz = pkg_check_modules('MOZ_HARFBUZZ', 'harfbuzz >= 2.7.4',
+                                    when='--with-system-harfbuzz')
+
+set_config('MOZ_SYSTEM_HARFBUZZ', depends_if(system_harfbuzz)(lambda _: True))
+
 # Apple platform decoder support
 # ==============================================================
 @depends(toolkit)
-- 
2.34.1