Fix blurry content after disabling dev tools emulation

cc/blimp/layer_tree_host_remote.cc

Index: cc/blimp/layer_tree_host_remote.cc
diff --git a/cc/blimp/layer_tree_host_remote.cc b/cc/blimp/layer_tree_host_remote.cc
index b0158c13682a8e95112f71efb8bf28994eab47e6..e2a6307a5327b0c25cfa231fb577e5575e11c6a8 100644
--- a/cc/blimp/layer_tree_host_remote.cc
+++ b/cc/blimp/layer_tree_host_remote.cc
@@ -145,6 +145,11 @@ void LayerTreeHostRemote::SetNeedsCommit() {
   MainFrameRequested(FramePipelineStage::COMMIT);
 }
 
+void LayerTreeHostRemote::SetNeedsRecalculateRasterScales() {
+  // This is used by devtools to reraster content after changing device
+  // emulation modes, so doesn't need to be supported by Blimp.
+}
+
 bool LayerTreeHostRemote::BeginMainFrameRequested() const {
   return requested_pipeline_stage_for_next_frame_ != FramePipelineStage::NONE;
 }