Remove recent changes to use temp fbo to do stencil clears.

src/gpu/GrGpu.cpp

Index: src/gpu/GrGpu.cpp
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index 45a58afb4aadc327677162c338cd51c260908bc3..c4b155a2d46598e9d7c05f3eebf546a59080ef25 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -98,6 +98,15 @@ bool GrGpu::attachStencilBufferToRenderTarget(GrRenderTarget* rt) {
         return false;
     }
     if (this->createStencilBufferForRenderTarget(rt, width, height)) {
+        // Right now we're clearing the stencil buffer here after it is
+        // attached to an RT for the first time. When we start matching
+        // stencil buffers with smaller color targets this will no longer
+        // be correct because it won't be guaranteed to clear the entire
+        // sb.
+        // We used to clear down in the GL subclass using a special purpose
+        // FBO. But iOS doesn't allow a stencil-only FBO. It reports unsupported
+        // FBO status.
+        this->clearStencil(rt);
         GrStencilBuffer* sb = rt->renderTargetPriv().getStencilBuffer();
         sb->resourcePriv().setUniqueKey(sbKey);
         return true;