Add support for Fuchsia

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index b28edd0456dc3d91a05705da5e348f08a2fb4723..85f1624822bb7567c1c3b217970e443e4926451f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -70,13 +70,17 @@ skia_library_configs = [
   ":skia_library",
 ]
 
-# Chrome's GN environment is mostly helpful, but a couple default configs tend to get in the way.
-unwanted_configs = [
-  "//build/config/clang:find_bad_constructs",  # Chrome style checks.
-  "//build/config:feature_flags",  # A bunch of #defines we don't care about.
-]
+unwanted_configs = []
+
+if (!is_fuchsia) {

[mtklein, 2016/07/15 16:54:03]

Is this... you sync Skia under a Fuschia GN root, which doesn't have
//build/config/clang:find_bad_constructs or //build/config:feature_flags to
start with?

[abarth, 2016/07/15 17:48:54]

That's correct.  Our gn environment is less opinionated than Chromium's
environment.

+  # Chrome's GN environment is mostly helpful, but a couple default configs tend to get in the way.
+  unwanted_configs += [
+    "//build/config/clang:find_bad_constructs",  # Chrome style checks.
+    "//build/config:feature_flags",  # A bunch of #defines we don't care about.
+  ]
+}
 
-core_gypi = exec_script("build/gypi_to_gn.py",
+core_gypi = exec_script("//build/gypi_to_gn.py",
                         [
                           rebase_path("gyp/core.gypi"),
                           "--replace=<(skia_include_path)=include",
@@ -85,7 +89,7 @@ core_gypi = exec_script("build/gypi_to_gn.py",
                         "scope",
                         [ "gyp/core.gypi" ])
 
-effects_gypi = exec_script("build/gypi_to_gn.py",
+effects_gypi = exec_script("//build/gypi_to_gn.py",
                            [
                              rebase_path("gyp/effects.gypi"),
                              "--replace=<(skia_include_path)=include",
@@ -94,7 +98,7 @@ effects_gypi = exec_script("build/gypi_to_gn.py",
                            "scope",
                            [ "gyp/effects.gypi" ])
 
-gpu_gypi = exec_script("build/gypi_to_gn.py",
+gpu_gypi = exec_script("//build/gypi_to_gn.py",
                        [
                          rebase_path("gyp/gpu.gypi"),
                          "--replace=<(skia_include_path)=include",
@@ -103,7 +107,7 @@ gpu_gypi = exec_script("build/gypi_to_gn.py",
                        "scope",
                        [ "gyp/gpu.gypi" ])
 
-opts_gypi = exec_script("build/gypi_to_gn.py",
+opts_gypi = exec_script("//build/gypi_to_gn.py",
                         [
                           rebase_path("gyp/opts.gypi"),
                           "--replace=<(skia_include_path)=include",
@@ -112,7 +116,7 @@ opts_gypi = exec_script("build/gypi_to_gn.py",
                         "scope",
                         [ "gyp/opts.gypi" ])
 
-pdf_gypi = exec_script("build/gypi_to_gn.py",
+pdf_gypi = exec_script("//build/gypi_to_gn.py",
                        [
                          rebase_path("gyp/pdf.gypi"),
                          "--replace=<(skia_include_path)=include",
@@ -121,7 +125,7 @@ pdf_gypi = exec_script("build/gypi_to_gn.py",
                        "scope",
                        [ "gyp/pdf.gypi" ])
 
-utils_gypi = exec_script("build/gypi_to_gn.py",
+utils_gypi = exec_script("//build/gypi_to_gn.py",
                          [
                            rebase_path("gyp/utils.gypi"),
                            "--replace=<(skia_include_path)=include",
@@ -163,9 +167,14 @@ component("skia") {
     ":opts_avx",
     ":opts_sse41",
     ":opts_ssse3",
-    "third_party:zlib",
   ]
 
+  if (is_fuchsia) {
+    deps += [ "//third_party/zlib" ]

[mtklein, 2016/07/15 16:54:03]

Think we should just create third_party/zlib/BUILD.gn so we can unconditionally
include //third_party/zlib?

[abarth, 2016/07/15 17:48:54]

Yes, that would make more sense.  Do you want me to do that in this patch or do
you want to do that as a follow up?

+  } else {
+    deps += [ "third_party:zlib" ]
+  }
+
   libs = []
 
   sources = []
@@ -239,6 +248,12 @@ component("skia") {
     ]
     libs += [ "ApplicationServices.framework" ]
   }
+
+  if (is_fuchsia) {
+    sources += [
+      "src/ports/SkFontMgr_empty_factory.cpp",
+    ]
+  }
 }
 
 executable("example") {