Material Hybrid mode for tabstrip.

chrome/browser/ui/views/tabs/tab.h

Index: chrome/browser/ui/views/tabs/tab.h
diff --git a/chrome/browser/ui/views/tabs/tab.h b/chrome/browser/ui/views/tabs/tab.h
index 726ca754f97742bb3aad510a5b66dc88927c73f9..0cccafc0e1085ae26e4fe9d460c936a7d992b47a 100644
--- a/chrome/browser/ui/views/tabs/tab.h
+++ b/chrome/browser/ui/views/tabs/tab.h
@@ -161,6 +161,15 @@ class Tab : public gfx::AnimationDelegate,
   // toolbar images with custom themes.
   static int GetYInsetForActiveTabBackground();
 
+  // Returns the inverse of the slope of the diagonal portion of the tab outer
+  // border.  (This is a positive value, so it's specifically for the slope of
+  // the leading edge.)
+  //
+  // This returns the inverse (dx/dy instead of dy/dx) because we use exact
+  // values for the vertical distances between points and then compute the
+  // horizontal deltas from those.
+  static float GetInverseDiagonalSlope();
+
  private:
   friend class TabTest;
   friend class TabStripTest;