Fix TexImage2D clearing too agressively

gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
index 9ffef0b51610c3c743f4c7ead5d5b4f510b1e2d1..4a6de90bab58578c3032e6b2f156369ed8ecd778 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
@@ -662,6 +662,35 @@ void GLES2DecoderTestBase::DoTexImage2D(
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
 }
 
+void GLES2DecoderTestBase::DoTexImage2DSameSize(
+    GLenum target, GLint level, GLenum internal_format,
+    GLsizei width, GLsizei height, GLint border,
+    GLenum format, GLenum type,
+    uint32 shared_memory_id, uint32 shared_memory_offset) {
+  if (GLES2Decoder::IsAngle())
+  {
+    EXPECT_CALL(*gl_, TexSubImage2D(
+        target, level, 0, 0, width, height, format, type, _))
+        .Times(1)
+        .RetiresOnSaturation();
+  } else {
+    EXPECT_CALL(*gl_, GetError())
+        .WillOnce(Return(GL_NO_ERROR))
+        .RetiresOnSaturation();
+    EXPECT_CALL(*gl_, TexImage2D(target, level, internal_format,
+                                 width, height, border, format, type, _))
+        .Times(1)
+        .RetiresOnSaturation();
+    EXPECT_CALL(*gl_, GetError())
+        .WillOnce(Return(GL_NO_ERROR))
+        .RetiresOnSaturation();
+  }
+  TexImage2D cmd;
+  cmd.Init(target, level, internal_format, width, height, border, format,
+           type, shared_memory_id, shared_memory_offset);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+}
+
 void GLES2DecoderTestBase::DoRenderbufferStorage(
     GLenum target, GLenum internal_format, GLenum actual_format,
     GLsizei width, GLsizei height,  GLenum error) {