Work around for nexus 6 TexSubImage issue

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 63e215f58561ae4f6fecc538875933e6914e3e02..4c376329441d47c8551322fc296d8074e6e0a7c4 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -421,6 +421,10 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
         fUseDrawInsteadOfClear = true;
     }
 
+    if (kAdreno4xx_GrGLRenderer == ctxInfo.renderer()) {
+        fUseDrawInsteadOfPartialRenderTargetWrite = true;
+    }
+
     if (kGL_GrGLStandard == standard) {
         // ARB allows mixed size FBO attachments, EXT does not.
         if (ctxInfo.version() >= GR_GL_VER(3, 0) ||