Fix reording across rendertarget switching

src/gpu/GrReorderCommandBuilder.cpp

Index: src/gpu/GrReorderCommandBuilder.cpp
diff --git a/src/gpu/GrReorderCommandBuilder.cpp b/src/gpu/GrReorderCommandBuilder.cpp
index 8c318fd0d00b322b0d247b0a596b98802f0e33f6..4dc2201325852ef2f415d7958caea161356ce4f1 100644
--- a/src/gpu/GrReorderCommandBuilder.cpp
+++ b/src/gpu/GrReorderCommandBuilder.cpp
@@ -24,6 +24,7 @@ GrTargetCommands::Cmd* GrReorderCommandBuilder::recordDrawBatch(State* state, Gr
     static const int kMaxLookback = 10;
     int i = 0;
     batch->setPipeline(state->getPipeline());
+    GrRenderTarget* rt = state->getPipeline()->getRenderTarget();
     if (!this->cmdBuffer()->empty()) {
         GrTargetCommands::CmdBuffer::ReverseIter reverseIter(*this->cmdBuffer());
 
@@ -31,6 +32,11 @@ GrTargetCommands::Cmd* GrReorderCommandBuilder::recordDrawBatch(State* state, Gr
             if (Cmd::kDrawBatch_CmdType == reverseIter->type()) {
                 DrawBatch* previous = static_cast<DrawBatch*>(reverseIter.get());
 
+                // We cannot continue to search backwards if the render target changes
+                if (previous->fBatch->pipeline()->getRenderTarget() != rt) {
+                    break;
+                }
+
                 if (previous->fBatch->combineIfPossible(batch)) {
                     return NULL;
                 }