linux-win_cross-rel: Reenable most tests now that v8_use_snapshot defaults to...

linux-win_cross-rel: Reenable most tests now that v8_use_snapshot defaults to false in 64-bit win/cross builds.

crashpad_unittests remain disabled because crashpad still doesn't work
in cross builds.

Depending on impact on cycle time, I might re-disable browser_tests.

Bug: 495204
Change-Id: I1623a80f26c0ff5ee775417b8045f7d0b64e7560
Reviewed-on: https://chromium-review.googlesource.com/937685Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539203}

testing/buildbot/chromium.clang.json

@@ -10935,6 +10935,18 @@
         },
         "test": "blink_platform_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "os": "Windows-10"
+            }
+          ],
+          "shards": 10
+        },
+        "test": "browser_tests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
@@ -11012,6 +11024,28 @@
         },
         "test": "compositor_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "os": "Windows-10"
+            }
+          ]
+        },
+        "test": "content_browsertests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "os": "Windows-10"
+            }
+          ]
+        },
+        "test": "content_unittests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
@@ -11045,6 +11079,17 @@
         },
         "test": "device_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "os": "Windows-10"
+            }
+          ]
+        },
+        "test": "extensions_unittests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
@@ -11178,6 +11223,17 @@
         },
         "test": "native_theme_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "os": "Windows-10"
+            }
+          ]
+        },
+        "test": "net_unittests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
@@ -11323,6 +11379,17 @@
         },
         "test": "ui_base_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "os": "Windows-10"
+            }
+          ]
+        },
+        "test": "unit_tests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,
@@ -11345,6 +11412,17 @@
         },
         "test": "views_unittests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "os": "Windows-10"
+            }
+          ]
+        },
+        "test": "webkit_unit_tests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true,

testing/buildbot/test_suite_exceptions.pyl

@@ -352,7 +352,6 @@
     'remove_from': [
       # chromium.clang
       'CrWinAsanCov',
-      'linux-win_cross-rel',
       'ToTLinuxUBSanVptr',
       'UBSanVptr Linux',
       # chromium.fyi
@@ -1028,10 +1027,6 @@
     ],
   },
   'content_browsertests': {
-    'remove_from': [
-      # chromium.clang
-      'linux-win_cross-rel',
-    ],
     'modifications': {
       # chromium.android
       'KitKat Tablet Tester': {
@@ -1310,8 +1305,6 @@
   },
   'content_unittests': {
     'remove_from': [
-      # chromium.clang
-      'linux-win_cross-rel',
       # chromium.fyi
       'Fuchsia (dbg)',
       'Fuchsia ARM64',
@@ -1585,8 +1578,6 @@
   },
   'extensions_unittests': {
     'remove_from': [
-      # chromium.clang
-      'linux-win_cross-rel',
       # chromium.memory
       'Linux Chromium OS ASan LSan Tests (1)',
       'Mac ASan 64 Tests (1)',
@@ -2479,7 +2470,6 @@
     'remove_from': [
       # chromium.clang
       'CrWinAsanCov',
-      'linux-win_cross-rel',
       # chromium.fyi
       'CrWinAsanCov tester',
       'Fuchsia (dbg)',
@@ -3393,7 +3383,6 @@
     'remove_from': [
       # chromium.clang
       'CrWinAsanCov',
-      'linux-win_cross-rel',
       # chromium.fyi
       'CrWinAsanCov tester',
       # On chromium.linux, unclear why these aren't run on Cast.
@@ -3928,7 +3917,6 @@
       'CrWinAsan',
       'CrWinAsan(dll)',
       'CrWinAsanCov',
-      'linux-win_cross-rel',
       'ToTLinuxMSan',
       'ToTLinuxThinLTO',
       # chromium.fyi

tools/mb/mb.py

@@ -383,8 +383,6 @@ class MetaBuildWrapper(object):
       return []
 
     # This code is naive and just picks reasonable defaults per platform.
-    # TODO(thakis): This assumes that host platform is the same as
-    # target platform.
     if self.platform == 'darwin':
       os_dim = ('os', 'Mac-10.12')
     elif self.platform.startswith('linux'):