[Fuchsia] Add dependency on SDK version to GN rules for generators, etc.

Without this dependency making an SDK update containing e.g. a FIDL
generator change would not cause FIDL stubs to be regenerated.

Bug: 865059
Change-Id: If760cccfd0a2357abdd3f4f32281fb2dd79cbd43
Reviewed-on: https://chromium-review.googlesource.com/1142127
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576104}

build/config/fuchsia/fidl_library.gni

@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/fuchsia/config.gni")
+
 assert(is_fuchsia)
 
 # Template for FIDL libraries. Following parameters can be passed when
@@ -122,6 +124,8 @@ template("fidl_library") {
     script = "//build/gn_run_binary.py"
 
     inputs = [
+      # Depend on the SDK hash, to ensure rebuild if the SDK tools change.
+      rebase_path("$fuchsia_sdk/.hash"),
       _response_file,
     ]
 
@@ -145,6 +149,8 @@ template("fidl_library") {
     ]
 
     inputs = [
+      # Depend on the SDK hash, to ensure rebuild if the SDK tools change.
+      rebase_path("$fuchsia_sdk/.hash"),
       _json_representation,
     ]
 

build/config/fuchsia/package.gni

@@ -100,6 +100,11 @@ template("fuchsia_package") {
 
     script = "//build/gn_run_binary.py"
 
+    inputs = [
+      # Depend on the SDK hash, to ensure rebuild if the SDK tools change.
+      rebase_path("$fuchsia_sdk/.hash"),
+    ]
+
     outputs = [
       _key_file,
     ]
@@ -124,6 +129,8 @@ template("fuchsia_package") {
     ]
 
     inputs = [
+      # Depend on the SDK hash, to ensure rebuild if the SDK tools change.
+      rebase_path("$fuchsia_sdk/.hash"),
       _key_file,
     ]
 
@@ -155,6 +162,8 @@ template("fuchsia_package") {
     ]
 
     inputs = [
+      # Depend on the SDK hash, to ensure rebuild if the SDK tools change.
+      rebase_path("$fuchsia_sdk/.hash"),
       _meta_far_file,
       _archive_manifest,
     ]