Use system FreeType on Linux.

This saves 406KB in the binary size of the plugin. More importantly, it gets rid of the linker flag preventing bundling PDFium into the Chromium binary.

BUG=453844
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/826613004

1 files changed, 19 insertions, 5 deletions

diff --git a/BUILD.gn b/BUILD.gn
index efabf9f9e2..9c58b0396c 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -6,13 +6,15 @@ import("//testing/test.gni")
 
 pdf_use_skia = false
 
+declare_args() {
+  # On Android there's no system FreeType. On Windows and Mac, only a few
+  # methods are used from it.
+  bundle_freetype = !is_linux
+}
+
 config("pdfium_config") {
   cflags = []
-  include_dirs = [
-    "third_party/freetype/include"
-  ]
   defines = [
-    "FT2_BUILD_LIBRARY",
     "_FPDFSDK_LIB",
     "_NO_GDIPLUS_",  # workaround text rendering issues on Windows
     "OPJ_STATIC",
@@ -40,6 +42,13 @@ config("pdfium_config") {
       "/wd4345",
     ]
   }
+
+  if (bundle_freetype) {
+    include_dirs = [ "third_party/freetype/include" ]
+    defines += [ "FT2_BUILD_LIBRARY" ]
+  } else {
+    include_dirs = [ "/usr/include/freetype2" ]
+  }
 }
 
 static_library("pdfium") {
@@ -92,7 +101,6 @@ static_library("pdfium") {
 
   deps = [
     "third_party:bigint",
-    "third_party:freetype",
     "third_party:safemath",
     ":fdrm",
     ":formfiller",
@@ -115,6 +123,12 @@ static_library("pdfium") {
   if (is_mac) {
     libs += [ "AppKit.framework", "CoreFoundation.framework" ]
   }
+
+  if (bundle_freetype) {
+    deps += [ "third_party:freetype" ]
+  } else {
+    libs += [ "freetype" ]
+  }
 }
 
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