Generate ComputedStyle::hasViewportUnits and hasRemUnits.

third_party/WebKit/Source/build/scripts/make_computed_style_base.py

Index: third_party/WebKit/Source/build/scripts/make_computed_style_base.py
diff --git a/third_party/WebKit/Source/build/scripts/make_computed_style_base.py b/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
index fc1a1715f6980ef9ae73d7c69508c1744fa096e8..f2e0ae0c5b5457a7e14db0e7cc6ad67f923ed746 100755
--- a/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
+++ b/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
@@ -50,6 +50,12 @@ NONPROPERTIES = [
     # Explicitly inherits a non-inherited property
     {'name': 'HasExplicitlyInheritedProperties', 'field_template': 'monotonic_flag',
      'inherited': False, 'independent': False, 'default_value': False},
+    # These are set if we used viewport or rem units when resolving a length.
+    # TODO(shend): HasViewportUnits should be a monotonic_flag.
+    {'name': 'HasViewportUnits', 'field_template': 'flag', 'default_value': 'false',

[nainar, 2017/04/05 16:41:49]

why isnt it a monotonic flag for my own understanding?

[shend, 2017/04/05 22:32:36]

Good question. setHasViewportUnits currently takes a boolean argument because of
a hack discussed in https://codereview.chromium.org/2767853002. I'll update the
CL description.

[alancutter (OOO until 2018), 2017/04/06 04:18:49]

I don't think this "hack" is the reason it's not a monotonic_flag. The reason is
because some places sets it false. Also your updated description has the two
fields backwards in this regard.

+     'inherited': False, 'independent': False},
+    {'name': 'HasRemUnits', 'field_template': 'monotonic_flag', 'default_value': 'false',
+     'inherited': False, 'independent': False},
     # These properties only have generated storage, and their methods are handwritten in ComputedStyle.
     # TODO(shend): Remove these fields and delete the 'storage_only' template.
     {'name': 'EmptyState', 'field_template': 'storage_only', 'size': 1, 'default_value': 'false',