Change ResourcePool reuse to have looser size constraints.

cc/resources/resource_pool_unittest.cc

Index: cc/resources/resource_pool_unittest.cc
diff --git a/cc/resources/resource_pool_unittest.cc b/cc/resources/resource_pool_unittest.cc
index 53ccf4541001c9fb2a0d034a2d984e741bf03e25..9ed34ea12d15ac80ff62341ec069fefaefc76ec4 100644
--- a/cc/resources/resource_pool_unittest.cc
+++ b/cc/resources/resource_pool_unittest.cc
@@ -310,5 +310,61 @@ TEST_F(ResourcePoolTest, UpdateContentIdAndInvalidatedRect) {
   resource_pool_->ReleaseResource(reacquired_resource);
 }
 
+TEST_F(ResourcePoolTest, ReuseResourceExactMatch) {
+  ResourceFormat format = RGBA_8888;
+  gfx::ColorSpace color_space = gfx::ColorSpace::CreateSRGB();
+
+  // Create unused resources with sizes close to 100, 100.
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(99, 100), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(99, 99), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(100, 99), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(101, 101), format, color_space));
+  resource_pool_->CheckBusyResources();
+
+  gfx::Size size(100, 100);
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(size, size, format, color_space));
+  size = gfx::Size(100, 99);
+  EXPECT_NE(nullptr,
+            resource_pool_->ReuseResource(size, size, format, color_space));
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(size, size, format, color_space));
+}
+
+TEST_F(ResourcePoolTest, ReuseResourceFuzzyMatch) {
+  ResourceFormat format = RGBA_8888;
+  gfx::ColorSpace color_space = gfx::ColorSpace::CreateSRGB();
+
+  // Create unused resources with sizes close to 100, 100.
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(99, 100), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(99, 99), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(100, 99), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(101, 101), format, color_space));
+  resource_pool_->ReleaseResource(
+      resource_pool_->CreateResource(gfx::Size(202, 202), format, color_space));
+  resource_pool_->CheckBusyResources();
+
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(
+                gfx::Size(50, 100), gfx::Size(50, 102), format, color_space));
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(
+                gfx::Size(100, 102), gfx::Size(102, 102), format, color_space));
+  EXPECT_NE(nullptr,
+            resource_pool_->ReuseResource(
+                gfx::Size(100, 100), gfx::Size(200, 200), format, color_space));
+  EXPECT_EQ(nullptr,
+            resource_pool_->ReuseResource(
+                gfx::Size(100, 100), gfx::Size(200, 200), format, color_space));
+}
+
 }  // namespace
 }  // namespace cc