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 2f8d0f2ae6746b654e0f1d495f9282139549b82a..d9bf998f40c5dce0efd4f4c376c69de658ef5dd7 100644
--- a/cc/layer_tree_host_common_unittest.cc
+++ b/cc/layer_tree_host_common_unittest.cc
@@ -734,8 +734,6 @@ 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];
@@ -775,8 +773,6 @@ 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];
@@ -818,8 +814,6 @@ 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];
@@ -862,8 +856,6 @@ 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];
@@ -924,8 +916,6 @@ 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];
@@ -986,8 +976,6 @@ 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];
@@ -1059,8 +1047,6 @@ 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];
@@ -1170,8 +1156,6 @@ 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];
@@ -1217,8 +1201,6 @@ 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];
@@ -1254,8 +1236,6 @@ 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];
@@ -2627,8 +2607,6 @@ 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);
@@ -2642,8 +2620,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForEmptyLayerList)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
@@ -2684,8 +2660,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleLayer)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForUninvertibleTransform)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix uninvertibleTransform;
@@ -2745,8 +2719,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForUninvertibleTransform)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSinglePositionedLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
@@ -2788,8 +2760,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForSinglePositionedLayer)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleRotatedLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
@@ -2839,8 +2809,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForSingleRotatedLayer)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForSinglePerspectiveLayer)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(12345);
 
     WebTransformationMatrix identityMatrix;
@@ -2901,8 +2869,6 @@ 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;
@@ -2963,8 +2929,6 @@ 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);
 
@@ -3031,8 +2995,6 @@ 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;
@@ -3131,8 +3093,6 @@ 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);
 
@@ -3192,8 +3152,6 @@ TEST(LayerTreeHostCommonTest, verifyHitTestingForNonClippingIntermediateLayer)
 
 TEST(LayerTreeHostCommonTest, verifyHitTestingForMultipleLayers)
 {
-    DebugScopedSetImplThread thisScopeIsOnImplThread;
-
     scoped_ptr<LayerImpl> root = LayerImpl::create(1);
 
     WebTransformationMatrix identityMatrix;
@@ -3297,8 +3255,6 @@ 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;