Switch to LayoutThemeMobile when emulating mobile device in DevTools.

third_party/WebKit/Source/core/style/ComputedStyle.cpp

Index: third_party/WebKit/Source/core/style/ComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.cpp b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
index c3b28edacb650bac880d9eb4cb8ec91bafe68ee0..0e2e86a9cb578a52d4ede6ef93eb726be108b82f 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
@@ -83,6 +83,18 @@ PassRefPtr<ComputedStyle> ComputedStyle::createInitialStyle()
     return adoptRef(new ComputedStyle(InitialStyle));
 }
 
+void ComputedStyle::clearInitialStyle()

[dgozman, 2016/02/11 18:53:44]

I need some kind of invalidation mechanism which rebuilds initial style created
with DEFINE_STATIC_GLOBAL. I tried to make it least intrusive, but any ideas are
welcome.

[pdr., 2016/02/12 06:36:14]

Can you help me understand why this needs to be rebuilt? Is this just for
tapHighlightColor or is it for more?

Is it okay that this leaks a full computed style every time?

Is this even safe to change? Won't existing pages that have a reference to this
object get very confused?

[dgozman, 2016/02/19 19:15:16]

I'm only aware of tapHighlightColor, but perhaps something may arise in the
future.
I could try to solve this differently - e.g. by invalidating tapHighlightColor
specifically.
It should not, |holder| below takes care of that.
ComputedStyle is refcounted so all objects holding a raw pointer to it should be
stack allocated.
https://code.google.com/p/chromium/codesearch#search/&q=ComputedStyle%5C*%5B%...

+{
+    ComputedStyle** pointer = initialStylePointer();
+    if (!*pointer)
+        return;
+    RefPtr<ComputedStyle> holder = adoptRef(*pointer);
+    {
+        LEAK_SANITIZER_DISABLED_SCOPE;
+        *pointer = createInitialStyle().leakRef();
+    }
+}
+
 PassRefPtr<ComputedStyle> ComputedStyle::createAnonymousStyleWithDisplay(const ComputedStyle& parentStyle, EDisplay display)
 {
     RefPtr<ComputedStyle> newStyle = ComputedStyle::create();