Compile blink/renderer/platform/ with -Wshadow.

No code changes required.

Bug: 294205
Change-Id: I7b69be39368da781a0ac95562ecab34c43fe6e01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464272Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816487}

third_party/blink/renderer/platform/blob/BUILD.gn

@@ -19,6 +19,8 @@ source_set("generator") {
 }
 
 blink_platform_sources("blob") {
+  configs += [ "//build/config/compiler:noshadowing" ]
+
   sources = [
     "blob_bytes_provider.cc",
     "blob_bytes_provider.h",

third_party/blink/renderer/platform/heap/BUILD.gn

@@ -43,6 +43,8 @@ source_set("heap_unsanitized") {
 }
 
 blink_platform_sources("heap") {
+  configs += [ "//build/config/compiler:noshadowing" ]
+
   sources = [
     "atomic_entry_flag.h",
     "blink_gc.cc",

third_party/blink/renderer/platform/instrumentation/BUILD.gn

@@ -5,6 +5,8 @@
 import("//third_party/blink/renderer/platform/platform.gni")
 
 blink_platform_sources("instrumentation") {
+  configs += [ "//build/config/compiler:noshadowing" ]
+
   sources = [
     "canvas_memory_dump_provider.cc",
     "canvas_memory_dump_provider.h",

third_party/blink/renderer/platform/loader/BUILD.gn

@@ -12,6 +12,8 @@ make_names("make_platform_loader_generated_fetch_initiator_type_names") {
 }
 
 blink_platform_sources("loader") {
+  configs += [ "//build/config/compiler:noshadowing" ]
+
   sources = [
     "allowed_by_nosniff.cc",
     "allowed_by_nosniff.h",

third_party/blink/renderer/platform/network/BUILD.gn

@@ -22,6 +22,8 @@ group("make_generated") {
 }
 
 blink_platform_sources("network") {
+  configs += [ "//build/config/compiler:noshadowing" ]
+
   sources = [
     "content_security_policy_parsers.cc",
     "content_security_policy_parsers.h",

third_party/blink/renderer/platform/scheduler/BUILD.gn

@@ -7,6 +7,8 @@ import("//third_party/blink/renderer/platform/platform.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 blink_platform_sources("scheduler") {
+  configs += [ "//build/config/compiler:noshadowing" ]
+
   sources = [
     "common/cancelable_closure_holder.cc",
     "common/cancelable_closure_holder.h",

third_party/blink/renderer/platform/wtf/BUILD.gn

@@ -33,6 +33,8 @@ config("wtf_config") {
 }
 
 component("wtf") {
+  configs += [ "//build/config/compiler:noshadowing" ]
+
   sources = [
     "allocator/allocator.cc",
     "allocator/allocator.h",