[chromium] Remove viewport memory restrictions

[chromium] Remove viewport memory restrictions
https://bugs.webkit.org/show_bug.cgi?id=83316

Reviewed by Adrienne Walker.

We remove the memory restriction on web pages based on viewport size
on desktop. This is causing pages that have complex use of layers to
end up hitting our memory limits, and moreso when the window is small.
Page complexity is not really a function of the viewport size.

We drop the mininum memory limit entirely, and just evict all
unprotected textures instead.

Covered by existing tests.

* platform/graphics/chromium/TextureManager.cpp:
(WebCore::TextureManager::highLimitBytes):
(WebCore::TextureManager::reclaimLimitBytes):
* platform/graphics/chromium/TextureManager.h:
(TextureManager):
* platform/graphics/chromium/cc/CCLayerTreeHost.cpp:
(WebCore::CCLayerTreeHost::beginCommitOnImplThread):
(WebCore::CCLayerTreeHost::setVisible):
(WebCore::CCLayerTreeHost::didBecomeInvisibleOnImplThread):
(WebCore::CCLayerTreeHost::updateLayers):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114191 268f45cc-cd09-0410-ab3c-d52691b4dbfc