graphite: Split backend include sources in build

Without splitting backend public includes from private sources, it's not
possible to make gn check pass in Chromium when enabling Graphite by
default. In Chromium, we want to allow Skia dependents like viz or gpu
to depend on Graphite backend specific headers e.g. DawnTypes.h so we
want to put those in the "public" sources for the skia component.

Bug: b/279229242
Change-Id: I54697dedad1ee17187253f0fd1cb6d867769c3d5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/677136
Commit-Queue: Sunny Sachanandani <[email protected]>
Reviewed-by: Kevin Lubick <[email protected]>

Author: sunnyps

BUILD.gn

@@ -1288,10 +1288,12 @@ optional("graphite") {
   }
 
   if (skia_use_dawn) {
+    public += skia_graphite_dawn_public
     sources += skia_graphite_dawn_sources
   }
   if (skia_use_metal) {
     public_defines += [ "SK_METAL" ]
+    public += skia_graphite_mtl_public
     sources += skia_graphite_mtl_sources
     if (skia_enable_metal_debug_info) {
       public_defines += [ "SK_ENABLE_MTL_DEBUG_INFO" ]
@@ -1303,6 +1305,7 @@ optional("graphite") {
     }
   }
   if (skia_use_vulkan) {
+    public += skia_graphite_vk_public
     sources += skia_graphite_vk_sources
   }
   if (skia_enable_precompile) {

gn/graphite.gni

@@ -193,10 +193,13 @@ skia_graphite_sources = [
   "$_src/text/AtlasManager.h",
 ]
 
-skia_graphite_dawn_sources = [
+skia_graphite_dawn_public = [
   "$_include/dawn/DawnBackendContext.h",
   "$_include/dawn/DawnTypes.h",
   "$_include/dawn/DawnUtils.h",
+]
+
+skia_graphite_dawn_sources = [
   "$_include_private/DawnTypesPriv.h",
   "$_src/dawn/DawnAsyncWait.cpp",
   "$_src/dawn/DawnAsyncWait.h",
@@ -223,10 +226,13 @@ skia_graphite_dawn_sources = [
   "$_src/dawn/DawnTypesPriv.cpp",
 ]
 
-skia_graphite_mtl_sources = [
+skia_graphite_mtl_public = [
   "$_include/mtl/MtlBackendContext.h",
   "$_include/mtl/MtlGraphiteTypes.h",
   "$_include/mtl/MtlGraphiteUtils.h",
+]
+
+skia_graphite_mtl_sources = [
   "$_include_private/MtlGraphiteTypesPriv.h",
   "$_src/mtl/MtlBlitCommandEncoder.h",
   "$_src/mtl/MtlBuffer.h",
@@ -256,9 +262,12 @@ skia_graphite_mtl_sources = [
   "$_src/mtl/MtlTexture.mm",
 ]
 
-skia_graphite_vk_sources = [
+skia_graphite_vk_public = [
   "$_include/vk/VulkanGraphiteTypes.h",
   "$_include/vk/VulkanGraphiteUtils.h",
+]
+
+skia_graphite_vk_sources = [
   "$_include_private/VulkanGraphiteTypesPriv.h",
   "$_src/vk/VulkanBuffer.cpp",
   "$_src/vk/VulkanBuffer.h",