Remove static thread pointers from CC

cc/font_atlas.cc

Index: cc/font_atlas.cc
diff --git a/cc/font_atlas.cc b/cc/font_atlas.cc
index 099e7f0d5819c0e774783d40e883b869fe08c8d9..aabeb7e217cb8aa6361cd3eff44c12f3dd785653 100644
--- a/cc/font_atlas.cc
+++ b/cc/font_atlas.cc
@@ -28,7 +28,7 @@ FontAtlas::~FontAtlas()
 
 void FontAtlas::drawText(SkCanvas* canvas, const SkPaint& paint, const std::string& text, const gfx::Point& destPosition, const gfx::Size& clip) const
 {
-    DCHECK(Proxy::isImplThread());
+    DCHECK(m_threadChecker.CalledOnValidThread());
 
     std::vector<std::string> lines;
     base::SplitString(text, '\n', &lines);
@@ -44,7 +44,7 @@ void FontAtlas::drawText(SkCanvas* canvas, const SkPaint& paint, const std::stri
 
 void FontAtlas::drawOneLineOfTextInternal(SkCanvas* canvas, const SkPaint& paint, const std::string& textLine, const gfx::Point& destPosition) const
 {
-    DCHECK(Proxy::isImplThread());
+    DCHECK(m_threadChecker.CalledOnValidThread());
 
     gfx::Point position = destPosition;
     for (unsigned i = 0; i < textLine.length(); ++i) {
@@ -78,7 +78,7 @@ gfx::Size FontAtlas::textSize(const std::string& text)
 
 void FontAtlas::drawDebugAtlas(SkCanvas* canvas, const gfx::Point& destPosition) const
 {
-    DCHECK(Proxy::isImplThread());
+    DCHECK(m_threadChecker.CalledOnValidThread());
 
     SkIRect source = SkIRect::MakeWH(m_atlas.width(), m_atlas.height());
     canvas->drawBitmapRect(m_atlas, &source, SkRect::MakeXYWH(destPosition.x(), destPosition.y(), m_atlas.width(), m_atlas.height()));