Revert of cc: Change required_for_activation bookkeeping.

Revert of cc: Change required_for_activation bookkeeping. (https://codereview.chromium.org/257773009/)

Reason for revert:
Caused context_lost tests to hang on Win and Mac GPU bots. See original CL for links to failing builds.


Original issue's description:
> cc: Change required_for_activation bookkeeping.
> 
> This patch changes the bookkeeping of whether required for activation
> tiles all received memory during AssignGpuMemory. The new approach
> doesn't rely on the fact that we process every tile in that loop, thus
> allowing us to early out or use another approach at getting tiles that
> does not guarantee that every tile will be visited.
> 
> The end goal is to evaluate if we can activate when the rasterizer
> notifies us that all tasks given to it that are required for
> activation are finished rather than trying to figure this out
> when we schedule tasks.
> 
> R=reveman, enne
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=267400

TBR=enne@chromium.org,reveman@chromium.org,vmpstr@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=267521

[Ken Russell (switch to Gerrit), 2014-05-01 13:12:38]

Created Revert of cc: Change required_for_activation bookkeeping.

[commit-bot: I haz the power, 2014-05-01 13:12:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kbr@chromium.org/269633006/1

[commit-bot: I haz the power, 2014-05-01 13:13:26]

Change committed as 267521

[Ted C, 2014-05-01 18:40:06]

On 2014/05/01 13:13:26, I haz the power (commit-bot) wrote:
> Change committed as 267521

I believe this revert also fixed:
https://code.google.com/p/chromium/issues/detail?id=369126

So you probably want to verify that behavior on Android before relanding,