blimp: Set up the CompositorDependencies for blimp in Chrome.

blimp/client/support/compositor/blimp_layer_tree_settings.cc

Index: blimp/client/support/compositor/blimp_layer_tree_settings.cc
diff --git a/blimp/client/support/compositor/blimp_layer_tree_settings.cc b/blimp/client/support/compositor/blimp_layer_tree_settings.cc
index f168e58aff3f47af33821346846e944635c7b402..7602735c2d5d14ea6f1d2b3f85d80ccfc0dc617e 100644
--- a/blimp/client/support/compositor/blimp_layer_tree_settings.cc
+++ b/blimp/client/support/compositor/blimp_layer_tree_settings.cc
@@ -10,12 +10,17 @@
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/sys_info.h"
+#include "blimp/client/support/compositor/blimp_gpu_memory_buffer_manager.h"
 #include "cc/base/switches.h"
 #include "cc/trees/layer_tree_settings.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/buffer_types.h"
 #include "ui/gl/gl_switches.h"
 
+#if defined(OS_ANDROID)
+#include "ui/gfx/android/device_display_info.h"
+#endif
+
 namespace blimp {
 namespace client {
 
@@ -168,6 +173,52 @@ void PopulateCommonLayerTreeSettings(cc::LayerTreeSettings* settings) {
   memory_policy.priority_cutoff_when_visible =
       gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE;
 #endif
+
+  int default_tile_size = 256;
+#if defined(OS_ANDROID)
+  gfx::DeviceDisplayInfo info;
+  bool real_size_supported = true;
+  int display_width = info.GetPhysicalDisplayWidth();
+  int display_height = info.GetPhysicalDisplayHeight();
+  if (display_width == 0 || display_height == 0) {
+    real_size_supported = false;
+    display_width = info.GetDisplayWidth();
+    display_height = info.GetDisplayHeight();
+  }
+
+  int portrait_width = std::min(display_width, display_height);
+  int landscape_width = std::max(display_width, display_height);
+
+  if (real_size_supported) {
+    // Maximum HD dimensions should be 768x1280
+    // Maximum FHD dimensions should be 1200x1920
+    if (portrait_width > 768 || landscape_width > 1280)
+      default_tile_size = 384;
+    if (portrait_width > 1200 || landscape_width > 1920)
+      default_tile_size = 512;
+
+    // Adjust for some resolutions that barely straddle an extra
+    // tile when in portrait mode. This helps worst case scroll/raster
+    // by not needing a full extra tile for each row.
+    if (default_tile_size == 256 && portrait_width == 768)
+      default_tile_size += 32;
+    if (default_tile_size == 384 && portrait_width == 1200)
+      default_tile_size += 32;
+  } else {
+    // We don't know the exact resolution due to screen controls etc.
+    // So this just estimates the values above using tile counts.
+    int numTiles = (display_width * display_height) / (256 * 256);
+    if (numTiles > 16)
+      default_tile_size = 384;
+    if (numTiles >= 40)
+      default_tile_size = 512;
+  }
+#endif
+  settings->default_tile_size.SetSize(default_tile_size, default_tile_size);
+
+  settings->renderer_settings.buffer_to_texture_target_map =
+      BlimpGpuMemoryBufferManager::GetDefaultBufferToTextureTargetMap();
+  settings->use_output_surface_begin_frame_source = true;
 }
 
 }  // namespace client