Add stencil-only clear bug workaround back but for all devices.

src/gpu/gl/GrGLGpu.cpp

Index: src/gpu/gl/GrGLGpu.cpp
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index 0793d7b0475079cdbb5615b1d89bc7dbbe8d5172..34ceb066e0740015c0b03bd7ca44c30d252e0e7e 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -1203,8 +1203,23 @@ bool GrGLGpu::createStencilBufferForRenderTarget(GrRenderTarget* rt, int width,
                 }
 
                 GL_CALL(ClearStencil(0));
+                // Many GL implementations seem to have trouble with clearing an FBO with only
+                // a stencil buffer.
+                GrGLuint tempRB;
+                GL_CALL(GenRenderbuffers(1, &tempRB));
+                GL_CALL(BindRenderbuffer(GR_GL_RENDERBUFFER, tempRB));
+                GL_CALL(RenderbufferStorage(GR_GL_RENDERBUFFER, GR_GL_RGBA8, width, height));
+                GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
+                                                GR_GL_COLOR_ATTACHMENT0,
+                                                GR_GL_RENDERBUFFER, tempRB));
+
                 GL_CALL(Clear(GR_GL_STENCIL_BUFFER_BIT));
 
+                GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
+                                                GR_GL_COLOR_ATTACHMENT0,
+                                                GR_GL_RENDERBUFFER, 0));
+                GL_CALL(DeleteRenderbuffers(1, &tempRB));
+
                 // Unbind the SB from the FBO so that we don't keep it alive.
                 GL_CALL(FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
                                                 GR_GL_STENCIL_ATTACHMENT,