check (thread-tricky) colortable after we've copied the bitmap into a per-thread context

src/core/SkBitmapProcShader.cpp

Index: src/core/SkBitmapProcShader.cpp
diff --git a/src/core/SkBitmapProcShader.cpp b/src/core/SkBitmapProcShader.cpp
index 2e42ef1b9a2e3e76d41ee59982600d92b2ccbdd4..2cfde655b8792791f150a78b210e071524a7f065 100644
--- a/src/core/SkBitmapProcShader.cpp
+++ b/src/core/SkBitmapProcShader.cpp
@@ -84,28 +84,7 @@ bool SkBitmapProcShader::isOpaque() const {
     return fRawBitmap.isOpaque();
 }
 
-static bool valid_for_drawing(const SkBitmap& bm) {
-    if (0 == bm.width() || 0 == bm.height()) {
-        return false;   // nothing to draw
-    }
-    if (NULL == bm.pixelRef()) {
-        return false;   // no pixels to read
-    }
-    if (kIndex_8_SkColorType == bm.colorType()) {
-        SkBitmap copy(bm);          // Locking and unlocking pixels is not thread safe,
-        SkAutoLockPixels alp(copy); // but we need to call it before getColorTable() is safe.
-        if (!copy.getColorTable()) {
-            return false;
-        }
-    }
-    return true;
-}
-
 SkShader::Context* SkBitmapProcShader::onCreateContext(const ContextRec& rec, void* storage) const {
-    if (!fRawBitmap.getTexture() && !valid_for_drawing(fRawBitmap)) {
-        return NULL;
-    }
-
     SkMatrix totalInverse;
     // Do this first, so we know the matrix can be inverted.
     if (!this->computeTotalInverse(rec, &totalInverse)) {