[Windows] Move to Visual Studio 2019 (#643)

Use Visual Studio 2019 to build the engine. This code was modified from Chromium: https://source.chromium.org/chromium/chromium/src/+/main:build/vs_toolchain.py;l=22-48

This is the pull request to update the engine: flutter/engine#37013

This is a requirement to roll ANGLE as it is affected by an STL bug if built using Visual Studio 2017: [angleproject#7693](https://bugs.chromium.org/p/angleproject/issues/detail?id=7693)

Part of: flutter/flutter#110948

Author: loic-sharma

build/config/mac/mac_sdk.gni

@@ -12,7 +12,7 @@ declare_args() {
   # Must be of the form x.x.x for Info.plist files.
   mac_deployment_target = "10.13.0"
 
-  # Path to a specific version of the Mac SDKJ, not including a backslash at
+  # Path to a specific version of the Mac SDK, not including a backslash at
   # the end. If empty, the path to the lowest version greater than or equal to
   # mac_sdk_min is used.
   mac_sdk_path = ""

build/vs_toolchain.py

@@ -36,8 +36,8 @@
 
 # VS versions are listed in descending order of priority (highest first).
 MSVS_VERSIONS = collections.OrderedDict([
-  ('2017', '15.0'),
   ('2019', '16.0'),
+  ('2017', '15.0'),
   ('2022', '17.0'),
 ])
 
@@ -421,17 +421,13 @@ def _CopyDebugger(target_dir, target_cpu):
 def _GetDesiredVsToolchainHashes():
   """Load a list of SHA1s corresponding to the toolchains that we want installed
   to build with."""
-  env_version = GetVisualStudioVersion()
-  if env_version == '2017':
-    # VS 2017 Update 9 (15.9.12) with 10.0.18362 SDK, 10.0.17763 version of
-    # Debuggers, and 10.0.17134 version of d3dcompiler_47.dll, with ARM64
-    # libraries.
-    toolchain_hash = '418b3076791776573a815eb298c8aa590307af63'
-    # Third parties that do not have access to the canonical toolchain can map
-    # canonical toolchain version to their own toolchain versions.
-    toolchain_hash_mapping_key = 'GYP_MSVS_HASH_%s' % toolchain_hash
-    return [os.environ.get(toolchain_hash_mapping_key, toolchain_hash)]
-  raise Exception('Unsupported VS version %s' % env_version)
+  # VS 2019 16.61 with 10.0.20348.0 SDK, 10.0.19041 version of Debuggers
+  # with ARM64 libraries and UWP support.
+  toolchain_hash = '1023ce2e82'
+  # Third parties that do not have access to the canonical toolchain can map
+  # canonical toolchain version to their own toolchain versions.
+  toolchain_hash_mapping_key = 'GYP_MSVS_HASH_%s' % toolchain_hash
+  return [os.environ.get(toolchain_hash_mapping_key, toolchain_hash)]
 
 
 def ShouldUpdateToolchain():