cc: Set the mapped memory reclaim limit for the renderer compositor on Android

cc/trees/layer_tree_host_pixeltest_readback.cc

Index: cc/trees/layer_tree_host_pixeltest_readback.cc
diff --git a/cc/trees/layer_tree_host_pixeltest_readback.cc b/cc/trees/layer_tree_host_pixeltest_readback.cc
index a9bc6ceff1b6f04bfe9a03772ad2faf82f27dd27..729a9aa3b5d763f05f28fdd15cd6774c1c746769 100644
--- a/cc/trees/layer_tree_host_pixeltest_readback.cc
+++ b/cc/trees/layer_tree_host_pixeltest_readback.cc
@@ -69,6 +69,10 @@ class LayerTreeHostReadbackPixelTest : public LayerTreePixelTest {
     ReadbackResultAsBitmap(CopyOutputResult::CreateBitmapResult(bitmap.Pass()));
   }
 
+  virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
+    settings->max_bytes_pending_upload = 16 * 1024 * 1024;
+  }
+
   gfx::Rect copy_subrect_;
 };
 
@@ -474,6 +478,7 @@ class LayerTreeHostReadbackDeviceScalePixelTest
   virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
     // Cause the device scale factor to be inherited by contents scales.
     settings->layer_transforms_should_scale_layer_contents = true;
+    settings->max_bytes_pending_upload = 16 * 1024 * 1024;
   }
 
   virtual void SetupTree() OVERRIDE {
@@ -639,6 +644,7 @@ class LayerTreeHostReadbackViaCompositeAndReadbackPixelTest
   virtual void InitializeSettings(LayerTreeSettings* settings) OVERRIDE {
     // Cause the device scale factor to be inherited by contents scales.
     settings->layer_transforms_should_scale_layer_contents = true;
+    settings->max_bytes_pending_upload = 16 * 1024 * 1024;
   }
 
   virtual void SetupTree() OVERRIDE {