Speculative fix for Android Debug only crash in r4049

http://codereview.appspot.com/6251049/



git-svn-id: http://skia.googlecode.com/svn/trunk@4053 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index c9c15df..470741e 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -857,8 +857,13 @@
     }
     
     ~GrAutoScratchTexture() {
+        this->reset();
+    }
+
+    void reset() {
         if (NULL != fContext) {
             fContext->unlockTexture(fEntry);
+            fEntry.reset();
         }
     }
 
@@ -866,10 +871,8 @@
                    const GrTextureDesc& desc,
                    GrContext::ScratchTexMatch match =
                         GrContext::kApprox_ScratchTexMatch) {
-        if (NULL != fContext) {
-            fContext->unlockTexture(fEntry);
-            fEntry.reset();
-        }
+        this->reset();
+
         fContext = context;
         if (NULL != fContext) {
             fEntry = fContext->lockScratchTexture(desc, match);