Add terrible workaround to fix stencil clear crash on S3.

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 b7901400fbd68c132c4b448e20874b9bb64ba291..51fc42b9954e154f447ddf2bb14c2608112f1b60 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -1210,8 +1210,27 @@ bool GrGLGpu::createStencilBufferForRenderTarget(GrRenderTarget* rt, int width,
                 }
 
                 GL_CALL(ClearStencil(0));
+                // At least some versions of the SGX 54x driver can't handle clearing a stencil
+                // buffer without a color buffer and will crash.
+                GrGLuint tempRB = 0;
+                if (kPowerVR54x_GrGLRenderer == this->ctxInfo().renderer()) {
+                    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(fboTarget,
+                                                    GR_GL_COLOR_ATTACHMENT0,
+                                                    GR_GL_RENDERBUFFER, tempRB));
+                }
+
                 GL_CALL(Clear(GR_GL_STENCIL_BUFFER_BIT));
 
+                if (tempRB) {
+                    GL_CALL(FramebufferRenderbuffer(fboTarget,
+                                                    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(fboTarget,
                                                 GR_GL_STENCIL_ATTACHMENT,