[Fuchsia] Use QEMU and QEMU host tools downloaded from CIPD.

QEMU will soon be removed from the Fuchsia SDK tarball.
This CL migrates our scripts to source QEMU from CIPD instead.

Change-Id: I2347a5be598a1eecd2d7c9e6c431b55c3eab1189
Reviewed-on: https://chromium-review.googlesource.com/1178975
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#584238}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: e6a59a6bf0c44a45fabe15389cd29373325eb4e8

config/fuchsia/BUILD.gn

@@ -121,8 +121,7 @@ action("blobstore_extended_qcow2") {
   ]
 
   args = [
-    rebase_path("//third_party/fuchsia-sdk/sdk/qemu/bin/qemu-img",
+    rebase_path("//third_party/qemu/bin/qemu-img", root_build_dir),
-                root_build_dir),
     "convert",
     "-f",
     "raw",

config/fuchsia/rules.gni

@@ -66,6 +66,7 @@ template("fuchsia_package_runner") {
       _manifest_path,
       "//build/fuchsia/",
       "//build/util/lib/",
+      "//third_party/qemu",
       "${fuchsia_sdk}/",
     ]
 

fuchsia/boot_data.py

@@ -85,7 +85,7 @@ def _MakeQcowDisk(output_dir, disk_path):
   """Creates a QEMU copy-on-write version of |disk_path| in the output
   directory."""
 
-  qimg_path = os.path.join(common.SDK_ROOT, 'qemu', 'bin', 'qemu-img')
+  qimg_path = os.path.join(common.QEMU_ROOT, 'bin', 'qemu-img')
   output_path = os.path.join(output_dir,
                              os.path.basename(disk_path) + '.qcow2')
   subprocess.check_call([qimg_path, 'create', '-q', '-f', 'qcow2',

fuchsia/common.py

@@ -6,6 +6,7 @@ import os
 
 DIR_SOURCE_ROOT = os.path.abspath(
     os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
+QEMU_ROOT = os.path.join(DIR_SOURCE_ROOT, 'third_party', 'qemu')
 SDK_ROOT = os.path.join(DIR_SOURCE_ROOT, 'third_party', 'fuchsia-sdk', 'sdk')
 
 def EnsurePathExists(path):

fuchsia/qemu_target.py

@@ -14,7 +14,7 @@ import subprocess
 import sys
 import time
 
-from common import SDK_ROOT, EnsurePathExists
+from common import QEMU_ROOT, EnsurePathExists
 
 
 # Virtual networking configuration data for QEMU.
@@ -55,7 +55,7 @@ class QemuTarget(target.Target):
       self.Shutdown()
 
   def Start(self):
-    qemu_path = os.path.join(SDK_ROOT, 'qemu', 'bin',
+    qemu_path = os.path.join(QEMU_ROOT, 'bin',
                              'qemu-system-' + self._GetTargetSdkLegacyArch())
     kernel_args = boot_data.GetKernelArgs(self._output_dir)