Remove static thread pointers from CC

cc/layer_tree_host_common_unittest.cc

Index: cc/layer_tree_host_common_unittest.cc
diff --git a/cc/layer_tree_host_common_unittest.cc b/cc/layer_tree_host_common_unittest.cc
index cf864f9f6b08799ce8290d76654e387b66b09bf8..42fb01e871e5fc239d2ad36479eda26b06621e72 100644
--- a/cc/layer_tree_host_common_unittest.cc
+++ b/cc/layer_tree_host_common_unittest.cc
@@ -785,8 +785,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithD
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // is the direct parent of the fixed-position layer.
-
-    DebugScopedSetImplThread scopedImplThread;
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -826,8 +824,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithT
     // Transforms are in general non-commutative; using something like a non-uniform scale
     // helps to verify that translations and non-uniform scales are applied in the correct
     // order.
-
-    DebugScopedSetImplThread scopedImplThread;
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -869,8 +865,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithD
 {
     // This test checks for correct scroll compensation when the fixed-position container
     // is NOT the direct parent of the fixed-position layer.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -913,8 +907,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithD
     // This test checks for correct scroll compensation when the fixed-position container
     // is NOT the direct parent of the fixed-position layer, and the hierarchy has various
     // transforms that have to be processed in the correct order.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -975,8 +967,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithM
     // This test checks for correct scroll compensation when the fixed-position container
     // is NOT the direct parent of the fixed-position layer, and the hierarchy has various
     // transforms that have to be processed in the correct order.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -1037,8 +1027,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithI
     // contributes to a different renderSurface than the fixed-position layer. In this
     // case, the surface drawTransforms also have to be accounted for when checking the
     // scrollDelta.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -1110,8 +1098,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithM
     // contributes to a different renderSurface than the fixed-position layer, with
     // additional renderSurfaces in-between. This checks that the conversion to ancestor
     // surfaces is accumulated properly in the final matrix transform.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -1221,8 +1207,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerWithC
     // itself has a renderSurface. In this case, the container layer should be treated
     // like a layer that contributes to a renderTarget, and that renderTarget
     // is completely irrelevant; it should not affect the scroll compensation.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -1268,8 +1252,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerThatI
     // This test checks the scenario where a fixed-position layer also happens to be a
     // container itself for a descendant fixed position layer. In particular, the layer
     // should not accidentally be fixed to itself.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -1305,8 +1287,6 @@ TEST(LayerTreeHostCommonTest, verifyScrollCompensationForFixedPositionLayerThatH
     // This test checks scroll compensation when a fixed-position layer does not find any
     // ancestor that is a "containerForFixedPositionLayers". In this situation, the layer should
     // be fixed to the viewport -- not the rootLayer, which may have transforms of its own.
-    DebugScopedSetImplThread scopedImplThread;
-
     scoped_ptr<LayerImpl> root = createTreeForFixedPositionTests();
     LayerImpl* child = root->children()[0];
     LayerImpl* grandChild = child->children()[0];
@@ -2678,8 +2658,6 @@ TEST(LayerTreeHostCommonTest, verifyBackFaceCullingWithPreserves3dForFlatteningS
 TEST(LayerTreeHostCommonTest, verifyHitTestingForEmptyLayerList)
 {
     // Hit testing on an empty renderSurfaceLayerList should return a null pointer.
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     std::vector<LayerImpl*> renderSurfaceLayerList;
 
     IntPoint testPoint(0, 0);
@@ -2693,8 +2671,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForEmptyLayerList)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
@@ -2735,8 +2711,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleLayer)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForUninvertibleTransform)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix uninvertibleTransform;
@@ -2796,8 +2770,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForUninvertibleTransform)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSinglePositionedLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
@@ -2839,8 +2811,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForSinglePositionedLayer)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleRotatedLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
@@ -2890,8 +2860,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleRotatedLayer)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSinglePerspectiveLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
@@ -2952,8 +2920,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleLayerWithScaledContents)
     // contentsScale is ignored, then hit testing will mis-interpret the visibleContentRect
     // as being larger than the actual bounds of the layer.
     //
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(1);
 
     WebTransformationMatrix identityMatrix;
@@ -3014,8 +2980,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForSimpleClippedLayer)
 {
     // Test that hit-testing will only work for the visible portion of a layer, and not
     // the entire layer bounds. Here we just test the simple axis-aligned case.
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
 
@@ -3082,8 +3046,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForMultiClippedRotatedLayer)
     // combined create a triangle. The rotatedLeaf will only be visible where it overlaps
     // this triangle.
     //
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(123);
 
     WebTransformationMatrix identityMatrix;
@@ -3182,8 +3144,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForNonClippingIntermediateLayer)
 {
     // This test checks that hit testing code does not accidentally clip to layer
     // bounds for a layer that actually does not clip.
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     WebTransformationMatrix identityMatrix;
     FloatPoint anchor(0, 0);
 
@@ -3243,8 +3203,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForNonClippingIntermediateLayer)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForMultipleLayers)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(1);
 
     WebTransformationMatrix identityMatrix;
@@ -3348,8 +3306,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForMultipleLayerLists)
     // The geometry is set up similarly to the previous case, but
     // all layers are forced to be renderSurfaces now.
     //
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(1);
 
     WebTransformationMatrix identityMatrix;