Fix Dawn's proxy groups to use public_deps instead of deps

To do perfect forwarding of GN targets, the proper method is to make a
group with public_deps. For example in the following:

 - Config C
 - Target T with a public_deps including C
 - Group G that proxies B
 - Target T2 that depends on G

If G uses deps = [ T ] then T2 won't see C, whereas if G uses
public_deps = [ T ] then T2 will dep on T, which will make it dep on C.

Bug: chromium:1064305
Change-Id: Iae236150c119b1a4003b957dcacf42e7759a936c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18965
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>

BUILD.gn

@@ -639,19 +639,19 @@ group("dawn_fuzzers") {
 ###############################################################################
 
 group("libdawn_native") {
-  deps = [
+  public_deps = [
     "src/dawn_native",
   ]
 }
 
 group("libdawn_native_sources") {
-  deps = [
+  public_deps = [
     "src/dawn_native:dawn_native_sources",
   ]
 }
 
 group("libdawn_wire") {
-  deps = [
+  public_deps = [
     "src/dawn_wire",
   ]
 }
@@ -659,21 +659,21 @@ group("libdawn_wire") {
 # Temporary groups to make a 5-way patch to fix crbug.com/913171
 group("dawn_unittests_temp_group") {
   testonly = true
-  deps = [
+  public_deps = [
     ":dawn_unittests",
   ]
 }
 
 group("dawn_end2end_tests_temp_group") {
   testonly = true
-  deps = [
+  public_deps = [
     ":dawn_end2end_tests",
   ]
 }
 
 group("dawn_perf_tests_temp_group") {
   testonly = true
-  deps = [
+  public_deps = [
     ":dawn_perf_tests",
   ]
   data_deps = [

src/dawn_native/BUILD.gn

@@ -604,7 +604,7 @@ dawn_component("dawn_native") {
 
 # Temporary group for a 3-way patch with Chromium
 group("libdawn_native_headers") {
-  deps = [
+  public_deps = [
     ":dawn_native_headers",
   ]
 }

src/dawn_wire/BUILD.gn

@@ -96,7 +96,7 @@ dawn_component("dawn_wire") {
 
 # Temporary group for a 3-way patch with Chromium
 group("libdawn_wire_headers") {
-  deps = [
+  public_deps = [
     ":dawn_wire_headers",
   ]
 }