cc: Consolidate the analysis_canvas operations

cc/tile_manager.cc

Index: cc/tile_manager.cc
diff --git a/cc/tile_manager.cc b/cc/tile_manager.cc
index 580759f7b10521a578edd93fa7cc495a42da1f60..8e51ce542007f7283970c1ccb39dbc2f99edaf55 100644
--- a/cc/tile_manager.cc
+++ b/cc/tile_manager.cc
@@ -17,6 +17,7 @@
 #include "cc/resource_pool.h"
 #include "cc/tile.h"
 #include "third_party/skia/include/core/SkDevice.h"
+#include "ui/gfx/rect_conversions.h"
 
 namespace cc {
 
@@ -176,7 +177,8 @@ TileManager::TileManager(
     TileManagerClient* client,
     ResourceProvider* resource_provider,
     size_t num_raster_threads,
-    bool use_cheapness_estimator)
+    bool use_cheapness_estimator,
+    bool solid_color_benchmarking)
     : client_(client),
       resource_pool_(ResourcePool::Create(resource_provider)),
       raster_worker_pool_(RasterWorkerPool::Create(this, num_raster_threads)),
@@ -188,7 +190,8 @@ TileManager::TileManager(
       record_rendering_stats_(false),
       use_cheapness_estimator_(use_cheapness_estimator),
       allow_cheap_tasks_(true),
-      did_schedule_cheap_tasks_(false) {
+      did_schedule_cheap_tasks_(false),
+      solid_color_benchmarking_(solid_color_benchmarking) {
   for (int i = 0; i < NUM_STATES; ++i) {
     for (int j = 0; j < NUM_TREES; ++j) {
       for (int k = 0; k < NUM_BINS; ++k)
@@ -817,6 +820,7 @@ TileManager::RasterTaskMetadata TileManager::GetRasterTaskMetadata(
   RasterTaskMetadata metadata;
   const ManagedTileState& mts = tile.managed_state();
   metadata.use_cheapness_estimator = use_cheapness_estimator_;
+  metadata.solid_color_benchmarking = solid_color_benchmarking_;
   metadata.is_tile_in_pending_tree_now_bin =
       mts.tree_bin[PENDING_TREE] == NOW_BIN;
   metadata.tile_resolution = mts.resolution;
@@ -939,7 +943,6 @@ void TileManager::RunRasterTask(uint8* buffer,
   int64 total_pixels_rasterized = 0;
   picture_pile->Raster(&canvas, rect, contents_scale,
                        &total_pixels_rasterized);
-
   if (stats) {
     stats->totalPixelsRasterized += total_pixels_rasterized;
 
@@ -957,11 +960,25 @@ void TileManager::RunRasterTask(uint8* buffer,
 
     if (metadata.use_cheapness_estimator) {
       bool is_predicted_cheap =
-          picture_pile->IsCheapInRect(rect, contents_scale);
+        picture_pile->IsCheapInRect(rect, contents_scale);
       bool is_actually_cheap = duration.InMillisecondsF() <= 1.0f;
       RecordCheapnessPredictorResults(is_predicted_cheap, is_actually_cheap);
     }
   }
+
+  if (metadata.solid_color_benchmarking) {
+    SkColor solid_color;
+    bool is_predicted_solid =
+      picture_pile->GetColorIfSolidInRect(rect, contents_scale, &solid_color);
+    bool is_predicted_transparent =
+      picture_pile->IsTransparentInRect(rect, contents_scale);
+
+    RecordSolidColorPredictorResults(buffer,
+                                     rect.width() * rect.height(),
+                                     is_predicted_solid,
+                                     solid_color,
+                                     is_predicted_transparent);
+  }
 }
 
 // static
@@ -976,6 +993,56 @@ void TileManager::RecordCheapnessPredictorResults(bool is_predicted_cheap,
                         is_predicted_cheap == is_actually_cheap);
 }
 
+//static
+void TileManager::RecordSolidColorPredictorResults(const uint8* actual_bytes,
+                                                   size_t pixel_count,
+                                                   bool is_predicted_solid,
+                                                   SkColor predicted_color,
+                                                   bool is_predicted_transparent) {
+  CHECK(pixel_count > 0);
+
+  bool is_actually_solid = true;
+  bool is_transparent = true;
+  SkColor actual_color = SkColorSetARGB(actual_bytes[3],
+                                        actual_bytes[2],
+                                        actual_bytes[1],
+                                        actual_bytes[0]);
+  for (int i = (pixel_count-1)*4; i >= 0; i -= 4) {
+    SkColor current_color = SkColorSetARGB(actual_bytes[i+3],
+                                           actual_bytes[i+2],
+                                           actual_bytes[i+1],
+                                           actual_bytes[i]);
+    if (current_color != actual_color ||
+        SkColorGetA(current_color) != 255)
+      is_actually_solid = false;
+
+    if (SkColorGetA(current_color) != 0)
+      is_transparent = false;
+  }
+
+  if (is_predicted_solid && !is_actually_solid)
+    UMA_HISTOGRAM_BOOLEAN("Renderer4.ColorPredictor.WrongActualNotSolid", true);
+  else if (is_predicted_solid &&
+           is_actually_solid &&
+           predicted_color != actual_color)
+    UMA_HISTOGRAM_BOOLEAN("Renderer4.ColorPredictor.WrongColor", true);
+  else if(!is_predicted_solid && is_actually_solid)
+    UMA_HISTOGRAM_BOOLEAN("Renderer4.ColorPredictor.WrongActualSolid", true);
+
+  bool correct_guess = (is_predicted_solid && is_actually_solid &&
+                        predicted_color == actual_color) ||
+                       (!is_predicted_solid && !is_actually_solid);
+  UMA_HISTOGRAM_BOOLEAN("Renderer4.ColorPredictor.Accuracy", correct_guess);
+
+  if (correct_guess)
+    UMA_HISTOGRAM_BOOLEAN("Renderer4.ColorPredictor.IsCorrectSolid", 
+                          is_predicted_solid);
+
+  if (is_predicted_transparent)
+    UMA_HISTOGRAM_BOOLEAN("Renderer4.ColorPredictor.PredictedTransparentIsActually", is_transparent);
+  UMA_HISTOGRAM_BOOLEAN("Renderer4.ColorPredictor.IsActuallyTransparent", is_transparent);
+}
+
 // static
 void TileManager::RunImageDecodeTask(skia::LazyPixelRef* pixel_ref,
                                      RenderingStats* stats) {