Add macros to define comparison operators to compare by reference or pointer interchangeably

Add macros to define comparison operators to compare by reference or pointer interchangeably

Add macros to define comparison operators to compare by reference or pointer
interchangeably. This avoids redefining them in Node, Frame and RenderObject.
There are 2 macros, one for refcounted types and another of non-refcounted
ones.

R=eseidel@chromium.org, adamk@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175399

[eseidel, 2014-06-03 00:33:53]

Kinda a odd place to put those macros, but OK.  Does Assertions.h know anything
about RefCounted?  maybe those belong in REfCounted?

[eseidel, 2014-06-03 00:34:04]

lgtm

[adamk, 2014-06-03 00:52:28]

lgtm

[Inactive, 2014-06-03 01:48:51]

On 2014/06/03 00:33:53, eseidel wrote:
> Kinda a odd place to put those macros, but OK.  Does Assertions.h know
anything
> about RefCounted?  maybe those belong in REfCounted?

Yes, I agree this is unrelated to assertions. I put it there because the
DEFINE_TYPE_CASTS() macro was already defined there and I couldn't find a better
place. I am not sure about RefCounted because only half the operators deal with
RefCounted, the rest doesn't (since RenderObject for example uses that macro and
is not RefCounted).

[Inactive, 2014-06-03 19:18:22]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-06-03 19:18:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/309083003/1

[commit-bot: I haz the power, 2014-06-03 19:57:51]

Change committed as 175399