[NOT FOR REVIEW] calc visible rect dynamically

[NOT FOR REVIEW] calc visible rect dynamically

This is an example of what this calculation could look like. This CL
needs step to verify calculation. Also this CL currently fails many
unittests which need investigation.

BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

[weiliangc, 2016-08-29 18:44:24]

Description was changed from

==========
[NOT FOR REVIEW] calc visible rect dynamically

This is an example of what this calculation could look like. This CL
needs step to verify calculation. Also this CL currently fails many
unittests which need investigation.

BUG=
==========

to

==========
[NOT FOR REVIEW] calc visible rect dynamically

This is an example of what this calculation could look like. This CL
needs step to verify calculation. Also this CL currently fails many
unittests which need investigation.

BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
==========

[weiliangc, 2016-08-29 18:45:26]

List of failed unittests:
    GpuRasterizationRasterizesBorderTiles.RunMultiThread_DelegatingRenderer
(../../cc/trees/layer_tree_host_unittest.cc:5996)
    GpuRasterizationRasterizesBorderTiles.RunSingleThread_DelegatingRenderer
(../../cc/trees/layer_tree_host_unittest.cc:5996)
    LayerTreeHostCommonTest.ChangeTransformOrigin
(../../cc/trees/layer_tree_host_common_unittest.cc:8235)
    LayerTreeHostCommonTest.DrawableAndVisibleContentRectsForSimpleLayers
(../../cc/trees/layer_tree_host_common_unittest.cc:3062)
    LayerTreeHostCommonTest.DrawableAndVisibleContentRectsForSurfaceHierarchy
(../../cc/trees/layer_tree_host_common_unittest.cc:3715)
    LayerTreeHostCommonTest.DrawableAndVisibleContentRectsInHighDPI
(../../cc/trees/layer_tree_host_common_unittest.cc:4064)
   
LayerTreeHostCommonTest.DrawableAndVisibleRectsWhenCannotRenderToSeparateSurface
(../../cc/trees/layer_tree_host_common_unittest.cc:3206)
    LayerTreeHostCommonTest.LargeTransforms
(../../cc/trees/layer_tree_host_common_unittest.cc:2679)
    LayerTreeHostCommonTest.RenderSurfaceClipsSubtree
(../../cc/trees/layer_tree_host_common_unittest.cc:8772)
    LayerTreeHostCommonTest.RootClipPropagationToClippedSurface
(../../cc/trees/layer_tree_host_common_unittest.cc:3931)
    LayerTreeHostCommonTest.SublayerScaleWithTransformNodeBetweenTwoTargets
(../../cc/trees/layer_tree_host_common_unittest.cc:9323)
    LayerTreeHostCommonTest.UpdateScrollChildPosition
(../../cc/trees/layer_tree_host_common_unittest.cc:8258)
   
LayerTreeHostCommonTest.VisibleContentRectForAnimatedLayerWithSingularTransform
(../../cc/trees/layer_tree_host_common_unittest.cc:7939)
    LayerTreeHostCommonTest.VisibleContentRectInChildRenderSurface
(../../cc/trees/layer_tree_host_common_unittest.cc:7769)
    LayerTreeHostCommonTest.VisibleContentRectsForClippedSurfaceWithEmptyClip
(../../cc/trees/layer_tree_host_common_unittest.cc:3387)
    LayerTreeHostCommonTest.VisibleRectsForClippedDescendantsOfUnclippedSurfaces
(../../cc/trees/layer_tree_host_common_unittest.cc:3775)
    LayerTreeHostCommonTest.VisibleRectsForPositionedRootLayerClippedByViewport
(../../cc/trees/layer_tree_host_common_unittest.cc:3046)
    LayerTreeHostImplTest.ExternalTransformAffectsVisibleRects
(../../cc/trees/layer_tree_host_impl_unittest.cc:9849)
    LayerTreeHostImplTest.ExternalViewportAffectsVisibleRects
(../../cc/trees/layer_tree_host_impl_unittest.cc:9816)
   
LayerTreeHostPictureTestChangeLiveTilesRectWithRecycleTree.RunMultiThread_DelegatingRenderer
(../../cc/trees/layer_tree_host_unittest_picture.cc:324)
    LayerTreeImplTest.UpdateViewportAndHitTest
(../../cc/trees/layer_tree_impl_unittest.cc:159)
    OcclusionTrackingPictureLayerImplTest.OccludedTilesConsideredDuringEviction
(../../cc/layers/picture_layer_impl_unittest.cc:4136)
    OcclusionTrackingPictureLayerImplTest.OccludedTilesNotMarkedAsRequired
(../../cc/layers/picture_layer_impl_unittest.cc:3849)
   
OcclusionTrackingPictureLayerImplTest.OccludedTilesSkippedDuringRasterization
(../../cc/layers/picture_layer_impl_unittest.cc:3756)
    OcclusionTrackingPictureLayerImplTest.OcclusionForDifferentScales
(../../cc/layers/picture_layer_impl_unittest.cc:3970)
    PictureLayerImplTest.RequiredTilesWithGpuRasterization
(../../cc/layers/picture_layer_impl_unittest.cc:2430)
    PictureLayerImplTest.ScrollPropagatesToPending
(../../cc/layers/picture_layer_impl_unittest.cc:4612)
    PictureLayerImplTest.TilingSetEvictionQueue
(../../cc/layers/picture_layer_impl_unittest.cc:2972)
    PictureLayerImplTest.TilingSetRasterQueue
(../../cc/layers/picture_layer_impl_unittest.cc:2792)
    TileManagerTilePriorityQueueTest.RasterTilePriorityQueueInvalidation
(../../cc/tiles/tile_manager_unittest.cc:449)