Download Fuchsia SDK.

Bug: None
Change-Id: I621408ab74ab3fa4f0ff60e53b000ef859223c93
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/265382
Reviewed-by: Sarah Pham <smpham@google.com>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37168}

DEPS

@@ -17,6 +17,10 @@ vars = {
 
   # ResultDB version
   'resultdb_version': 'git_revision:6cc18e2763e180929d70c786b419c1f8e6bcc66c',
+
+  # By default, download the fuchsia sdk from the public sdk directory.
+  'fuchsia_sdk_cipd_prefix': 'fuchsia/sdk/gn/',
+  'fuchsia_version': 'version:8.20220607.3.1',
 }
 
 deps = {
@@ -343,6 +347,17 @@ deps = {
       'dep_type': 'cipd',
   },
 
+  'src/third_party/fuchsia-sdk/sdk': {
+      'packages': [
+          {
+              'package': Var('fuchsia_sdk_cipd_prefix') + '${{platform}}',
+              'version': Var('fuchsia_version'),
+          },
+      ],
+      'condition': 'checkout_fuchsia',
+      'dep_type': 'cipd',
+  },
+
   'src/third_party/hamcrest': {
       'packages': [
           {
@@ -2255,17 +2270,6 @@ hooks = [
     'condition': 'checkout_mac',
     'action': ['python3', 'src/build/mac_toolchain.py'],
   },
-  {
-    # Update the Fuchsia SDK if necessary.
-    'name': 'Download Fuchsia SDK',
-    'pattern': '.',
-    'condition': 'checkout_fuchsia',
-    'action': [
-      'python3',
-      'src/build/fuchsia/update_sdk.py',
-      '--default-bucket=fuchsia',
-    ],
-  },
   {
     # Note: On Win, this should run after win_toolchain, as it may use it.
     'name': 'clang',