[Fuchsia] Allow x64 FYI Fuchsia Bots to Use AEMU.

Add AEMU to fuchsia_package_runner template.
Add Mixin for AEMU flag, apply mixin to FYI Fuchsia Bots.
Add missing filter for components_unittests.

Bug: 1000906
Change-Id: I495074e7d811db850c43b60dfd6e1ae052702781
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793522
Commit-Queue: Chong Gu <chonggu@google.com>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704938}

build/config/fuchsia/config.gni

@@ -19,6 +19,7 @@ if (current_cpu == "arm64") {
 }
 
 # Compute the qemu path.
+aemu_root = "//third_party/aemu-${host_os}-${host_cpu}"
 qemu_root = "//third_party/qemu-${host_os}-${host_cpu}"
 
 # Compute the path to the arch-specific boot image directory.

build/config/fuchsia/generate_runner_scripts.gni

@@ -97,6 +97,10 @@ template("fuchsia_package_runner") {
       "${boot_image_root}/qemu/zircon-a.zbi",
     ]
 
+    if (host_cpu == "x64" && target_cpu == "x64") {
+      data += [ "${aemu_root}/" ]
+    }
+
     executable_args = []
 
     package_paths = [ rebase_path(_package_path, root_build_dir) ]

testing/buildbot/mixins.pyl

@@ -193,6 +193,13 @@
       },
     },
   },
+  'fuchsia_aemu': {
+    '$mixin_append': {
+      'args': [
+        '--device=aemu',
+      ],
+    },
+  },
   'gpu_pool': {
     'swarming': {
       'dimensions': {

testing/buildbot/waterfalls.pyl

@@ -1737,7 +1737,8 @@
           'all',
         ],
         'mixins': [
-          'linux-xenial',
+          'fuchsia_aemu',
+	  'linux-xenial',
         ],
         'swarming': {
           'dimension_sets': [
@@ -1755,6 +1756,7 @@
           'all',
         ],
         'mixins': [
+	        'fuchsia_aemu',
           'linux-xenial',
         ],
         'swarming': {